ATTACHMENT 1
CARBON MONOXIDE
AIR QUALITY TRENDS AND INFORMATION
FOR THE CITIES LISTED IN THE
NATIONAL CLEAN AIR COALITION
PRESS RELEASE (December 9, 1981)
Monitoring and Data Analysis Division
Office of Air Quality Planning and Standards
January 1982
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Attachment 1
CARBON MONOXIDE
AIR QUALITY TRENDS AND INFORMATION
FOR THE CITIES LISTED IN THE
NATIONAL CLEAN AIR COALITION
PRESS RELEASE (December 9, 1981)
INTRODUCTION
• This report summarizes ambient CO air quality trends in the urban-
ized areas or cities identified by the National Clean Air Coalition
as having CO levels double the 8-hour average NAAQS.
• A summary of air quality trends in both the second maximum
8-hour average nonoverlapping concentration and the estimated
number of exceedances of the 8-hour NAAQS. Only those years
with at least 4000 hourly observations are plotted.
• Monitoring site information for the key monitoring sites measur-
ing the highest CO levels and the five highest daily 8-hour
average maximum CO concentrations at these sites.
• SIP design value.
In almost all locations, a decreasing trend can be seen 1n both
the annual second maximum 8-hour average CO concentrations and the
estimated number of exceedances.
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ANCHORAGE. ALASKA
AMBIENT AIR QUALITY INFORMATION
• From 1976-1980, 4 sites collected at least 4000 hourly observations
in one or more years. In 1980, 4 sites met this criteria and all
exceeded the 8-hour NAAQS.
• A short-term increase in CO levels from 1979-1980 can be seen in
both the graphs of the trends in the annual second maximum 8-hour
averages and the estimated number of exceedances of the 8-hour NAAQS.
• Site A, which has a longer historical record, showed an increase
in the second maximum value over the last five years as well as
over the last two years. The second maximum value changed from
12 ppm in 1976 to 15 ppm in 1980, an increase of 25% and from 11 ppm
in 1979 to 15 ppm in 1980 or 36%.
• The estimated number of exceedances decreased slightly over the
five year period from 22 to 19 or 14% and increased over the
last two years from 5 to 19.
t Site B, which recorded the highest second maximum 8-hour average
CO level in 1979 and 1980 increased from 17 ppm in 1979 to 26 ppm
in 1980 for an increase of 53%. During the same period, the estimated
number of exceedances increased from 71 to 75 or 6%.
SITE INFORMATION
ANCHORAGE, AK (B) 02-0040-017-F01 (2902 Spenard Rd.)
• This site is a microscale site on a heavily traveled traffic corridor
leading to the central business district.
• The monitoring probe is 3.8 meters high with a setback of 6.5 meters
from the nearest traffic lane on a street with an ADT of 18,000
vehicles. The site is 27 meters from an intersecting street with
an AOT of 16,000, The site does not exactly meet the probe height
restriction of 3.5 meters,
• This site 1s primarily influenced by mobile sources. The levels
of CO are also a result of strong low level winter thermal inversions
not uncommon to Alaska.
SIP DESIGN VALUE; 19 ppm
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YEAR 8-HOUr'avERAGE DAILY MAXIMA (PPM) IEML 8-HOUR AVERAGE DAILY MAXIMA im)
1st
2nd
3rd
4th
5th
1st
2nd
3rd
4th
6th
1975
18
18
17
17
16
1975
1976
12
11
11
11
11
1976
1977
16
14
12
10
10
1977
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1978
16
14
13
13
12
1978**
19
18
9
9
9
1979
12
11
10
10
9
1979
20
17
17
17
16
1980
17
16
13
12
12
1980
27
26
26
23
21
*S1tt not Mtitolfsiwd until 1978.
**L«SS titan 4000 hourly observations
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PHOENIX, ARIZONA
AMBIENT AIR QUALITY INFORMATION
• From 1976-1980, 11 sites collected at least 4000 hourly observa-
tions in one or more years. In 1980, 6 sites met this criteria
and 5 exceeded the 8-hour NAAQS.
• No obvious change in CO levels can be seen in both the graphs of
the trends in the annual second maximum 8-hour averages and the
estimated number of exceedances of the 8-hour NAAQS.
• Site D/E, which recorded the highest second maximum 8-hour average
CO level in 1980 decreased from 18 ppm in 1976 to 14 ppm in 1980
for a reduction of 22%. During this same period, the estimated
number of exceedances declined from 79 to 23 or 70%.
SITE INFORMATION
PHOENIX, AZ (D/E) 03-060Q-002-G01 (1845 E. Rosevelt)
• Site is a suburban commercial neighborhood scale site.
• The monitoring probe is 11 meters high and is setback 28 meters
from the nearest traffic lane. Average daily traffic (ADT)
is 8,000. The site meets neighborhood scale siting criteria.
• The site is predominantly influenced by mobile sources.
PHOENIX, AZ (no letter) 03-0600-016-G01 (W. Indian School Road)
• Site is a suburban traffic corridor microscale site.
• The monitoring probe is 3 meters high and setback 6 meters from
the nearest traffic lane. ADT is 47,000. The site meets the
siting criteria.
• The site 1s predominantly Influenced by mobile sources.
• The site is newly established and only reported 612 hours of
data to NADB in 1980.
SIP DESIGN VALUE: 24 ppm
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YEAR
8-HOUR AVERAGE DAILY MAXIMA (PPM)
*S1te not established until 1980 and collected
less then 4000 hourly observations so that 1t
1s not plotted on the above graphs.
SARQAD SITE NUMBER: 030600002001* PHOENIX, ARIZONA
(Sites D and E)
YEAR 8-HOUR AVERABE DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1st
2nd
3rd
4th
5th
1975
19 75
22
21
20
20
19
1976
1976
18
18
18
16
16
1977
1877
16
14
13
11
11
1978
1978
14
14
13
12
12
1979
--
WW
—
1979
16
15
14
14
14
1980
19
19
17
17
14
1980
17
14
14
14
13
•Site 1s Indicated as both Sites 0 and E because
It reflects a change 1n the CO monitoring method
between 1978 and 1979.
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LOS ANGELES, CALIFORNIA
AMBIENT AIR QUALITY INFORMATION
• Sixteen sites collected at least 4000 hourly observations in
one or more years during 1976-1980. In 1980, 12 sites met this
criteria and 10 exceeded the 8-hour NAAQS.
§ No clear trend in CO levels can be seen in the graphs of the
annual second maximum 8-hour averages while there is a general
decline in the estimated number of exceedances of the 8-hour
NAAQS.
• Site M, which recorded the highest second maximum 8-hour average
CO level in 1979 and 1980 Increased from 22 ppm in 1976 to 25 ppm
in 1980 for an increase of 12%. During this same period, the
estimated number of exceedances decreased from 206 to 121 or
42%.
SITE INFORMATION
LOS ANGELES. CA (M) 05-4260-001-101 (11220 Long Beach Blvd., Lynwood)
• Site is a middle scale suburban commercial site.
t The monitoring probe is 5 meters high and setback 8 meters
from the nearest traffic lane. The ADT is 30,000 and the
site meets the siting criteria.
t The site is predominantly influenced by mobile sources.
SIP DESIGN VALUE: 30 ppm
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SAROAD SITE NUMBER; 054260001101 LYNWOOD, CALIFORNIA
(Site M)
1MB. 8-HOUR AVERA6E DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
29
29
27
25
25
1976
23
22
22
20
20
1977
23
21
20
19
18
1978
21
19
19
19
18
1979
23
21
18
17
16
1980
26
25
20
20
20
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SAN FRANCISCO, CALIFORNIA
AMBIENT AIR QUALITY INFORMATION
• The National Clean Air Coalition listing of CO values for San
Francisco used a value from a site in San Jose. Since San Jose
is in a separate urbanized area, it should not be considered as
a monitoring site for San Francisco.
• From 1976-1980, 17 sites collected at least 4000 hourly observa-
tions in one or more years. In 1980, 13 sites met this criteria
and 2 exceeded the 8-hour NAAQS.
• A decline 1n CO levels can be seen in both the graphs of the
trends in the annual second maximum 8-hour averages and the
estimated number of exceedances of the 8-hour NAAQS.
• Site K which recorded the highest second maximum 8-hour average
CO level from 1976 to 1980, changed from 19 ppm in 1976 to 16 ppm
in 1980 for a decrease of 18^. During the same period, the esti-
mated number of exceedances decreased from 101 to 24 to 76%.
• Site K measured the highest concentration (9 ppm) in the city of
San Francisco in 1979.
SITE INFORMATION
SAN FRANCISCO, CA (K) 05-6860-003-101 (939 Ellis Street)
• Site is a city center commercial site which prior to 1981 did
not meet the current siting criteria because the probe was
too high.
• The site was 25 meters high and setback 25 meters from a 7,500
ADT road.
• The site has been upgraded in 1981 into a microscale street
canyon NAMS site by positioning the probe 3 meters high and
3 meters away from the same road.
• The site is predominantly Influenced by mobile sources.
SAN FRANCISCO, CA (Q) 05-8480-004-101 (Tuolume Street, Vallejo)
• This site is a residential neighborhood scale site.
The monitoring probe is 7 meters high and setback 25 meters from
a 1,000 ADT road. The site does meet the siting criteria.
• The site is predominantly influenced by mobile sources
SIP DESIGN VALUE: 20 ppm
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SARQAD SITE NUMBER: 058480004101 VALLEJO. CALIFORNIA
(Sit. Q)
!EAR 8-HOUR AVERAGE DAILY MAXIMA (PPM)
SARQAD SITE NUMBER; 056860003101 SAN FRANCISCO, CALIFORNIA
(S1t« K)
YEAR
8-HOUR AVERAGE DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1st
2nd
3rd
4th
5th
1975
—
...
—
—
1975
11
10
10
8
7
1976
18
15
15
14
14
1976
11
10
10
9
9
1977
14
13
12
11
11
1977
9
8
7
7
7
1978
10
9
9
8
8
1978
9
8
8
8
7
1979
9
9
8
8
8
1979
14
9
' 9
9
9
1980
13
10
9
8
8
1980
6
5
5
5
5
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DENVER, COLORADO
AMBIENT AIR QUALITY INFORMATION
• During the period, 1976-1980, 9 sites collected at least 4000
hourly observations in one or more years. In 1980, 6 sites met
this criteria and all exceeded the 8-hour NAAQS.
• No clear trend in CO levels can be seen in the graphs of the
annual second maximum 8-hour averages but a general decrease
is seen in the estimated number of exceedances of the 8-hour
NAAQS.
• Site G, which recorded the highest second maximum 8-hour average
CO level from 1977 to 1980 changed from 22 ppm in 1976 to 21 ppm
in 1980 for a decrease of 4%. During this same period, the esti-
mated number of exceedances decreased from 171 to 83 or 51%.
• Site E, which was previously operated by the Federal Government
as a CAMP site also displayed high CO levels, but decreased from
23 ppm in 1976 to 18 ppm in 1980 for a decrease of 22%. During
this same period, the estimated number of exceedances decreased
from 127 to 38 or 70%.
SITE INFORMATION
DENVER. CO(E)06-0580-002-F01 (2105 Broadway)
• Site is a roadway oriented site located in the central business
district.
• Site is predominantly influenced by mobile sources.
• The sampling probe is 5 meters high and 7 meters from a road of 17,000 ADT.
• This is a NAMS microscale site which has been granted a probe
height waiver. A new sampling probe 3 meters above the ground
1s being tested to determine 1f there is a significant difference
1n ambient CO measurements between the two levels.
DENVER CO (G) 06-0580-010-F01' (414 14th Street)
t Site is a roadway site located in the central business district.
• Site is predominantly influenced by mobile sources.
• The probe is approximately 6 meters high and 20 meters from a road
of 20,000-30,000 ADT.
• This site does not meet the microscale siting criteria because
the probe is too high and too far from the road. It does, however,
meet the siting criteria for a middle scale site.
SIP DESIGN VALUE: 23 ppm
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SAROAD SITE NUMBER; 060580002F01 DENVER, COLORADO
(S1t« E)
YEAR 8-HOUR AVERA6E DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
25
23
22
21
21
1976
28
23
21
19
19
1977
16
16
16
15
15
1978
24
23
23
22
20
1979
24
21
21
20
18
1980
19
18
16
15
14
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SAROAD SITE NUMBER; 06058001OFOl DENVER, COLORADO
(Site 6}
YEAR 8-HOUR AVERA6E DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
25
23
21
19
18
1976
25
22
20
19
17
1977
20
20
19
18
16
1978
24
24
23
22
20
1979
29
25
21
21
19
1980
22
21
21
17
16
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FAIRFIELD COUNTY, CONNECTICUT
AMBIENT AIR QUALITY INFORMATION
• During the period, 1976-1980, 6 sites collected at least 4000
hourly observations in one or more years. In 1980, two sites
met this criteria, but only one exceeded the 8-hour NAAQS.
• Fairfield County, Connecticut encompasses both Bridgeport and
Stamford.
• A site in Stamford was used to represent both Bridgeport and
Stamford in the National Clean Air Coalition Report.
• The Stamford site (Site E) records the highest CO values in
Fairfield County. The Stamford site is substantially higher
than the Bridgeport site (Site A).
• The Stamford site (Site E) shows a 19% decrease in the second
high 8-hour average concentration from 27 ppm in 1978 to 22 ppm
in 1980. During this same period, the estimated number of
exceedances of the 8-hour standard decreased from 421 in 1978
to 245 in 1980 for a decrease of 42%.
t The Bridgeport site (Site A) shows a 15% decrease in the second
high 8-hour average concentration from 11 ppm in 1976 to 9 ppm
in 1980 for a decrease of 15%. During this same period, the
estimated number of exceedances decreased from 8 to 0.
SITE INFORMATION
STAMFORD, CONNECTICUT (E) 07-1080-020-F01 96 Broad Street
• Site is a street canyon microscale site located in the central
business district.
t The monitoring probe is 3 meters high and setback 5 meters from
the nearest traffic lane. Average daily traffic (ADT) is 10,000.
The nearest intersecting street is 30 meters away and the ADT is
18,000. The site meets existing siting criteria.
• The site 1s predominantly influenced by mobile sources.
BRIDGEPORT, CONNECTICUT (A) 07-0060-004-F01 Jasper McLevv Hall
• Site is a street corridor site located in a center city commercial area.
• The monitoring probe is 3 meters high and setback 9 meters from the
roadway which has an ADT of 13,000. The nearest intersecting street
is 30 meters away and has an ADT of 14,000. The site meets the sit-
ing criteria.
• Because of recent changes in the area traffic pattern, special
studies are being conducted to determine if the site is now
located in the area of maximum concentration.
• The site is predominantly influenced by mobile sources.
SIP DESIGN VALUE /
The SIP design value is 31 ppm for Fairfield County. The State of
Connecticut used the Stamford site to designate the entire air quality
control region as nonattainment.
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(Site A)
YEAR 8-HOUR AVERAGE DAILY MAXIMA (PPM)
1975
1976
1977
1978
1979
1980
SAROAD SITE NUMBER: 07108G020F01* STAMFORD, CONNECTICUT
(Site E)
ISM 8-HOUR AVERAGE DAILY MAXIMA (PPM)
lit
2nd
3rd
4th
5th
1st
2nd
3rd
4th
5th
14
12
11
11
11
1975
—
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34
32
29
28
27
18
13
13
12
12
1978
28
28
26
26
26
11
8
7
7
7
1979
29
27
24
24
22
9
8
8
7
7
1980
25
22
21
20
20
•Site Established 1977,
~~Less than 4000 hourly observations.
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WASHINGTON, D.C.
AMBIENT AIR QUALITY INFORMATION
• During the period, 1976-1980, 20 sites collected at least 4000 hourly
observations in one or more years. In 1980, 6 sites met this criteria
and 2 exceeded the 8-hour NAAQS.
• No clear trend in CO levels can be seen over the 5-year period in both
the graphs of the trends in the annual second maximum 8-hour averages
and the estimated number of exceedances of the 8-hour NAAQS although
decreasing trends can be seen in the last 3 years in the number of
exceedances.
• From 1979 to 1980, the highest second maximum 8-hour average CO level
recorded at Site G decreased from 19 ppm in 1979 to 11 ppm in 1980
for a decrease of 42%. During this same period, the estimated
number of exceedances decreased from 12 to 5 or 58%.
• New site 09-0020-023-102 began operation in October 1980 and recorded
the highest concentration (13 ppm) for 1980. It is a microscale
site and meets siting criteria.
SITE INFORMATION
WASHINGTON, D.C. (B) 09-0020-003-A10 (427 New Jersey Ave., N.W.)
t Site was classified as a microscale site located in an alley in
the central business district.
t The monitoring probe was 5 meters high and out the side of a building
in a one lane alley. The probe was 15 meters from one street with an
estimated ADT of 25,000 and 50 meters from another street of 11,800
ADT. The site was next to a fire station with two sets of stoplights,
one of which.was in front of the alley, resulting in idling cars on
the street near probe inlet.
• The site was discontinued in 1979 because it did not meet the siting
criteria. Site met data validity criteria for 1975 and 1976.
« The site was predominantly Influenced by mobile sources.
WASHINGTON. D.C. IG) 09-0020-017-101 (West End Library)
• Site is located in a residential area.
• Site is Influenced by mobile sources.
• The probe is 10 meters high and 25 meters from a road of 12,000 ADT.
• This is the NAMS neighborhood scale site and meets the siting criteria.
SIP DESIGN VALUE: 16 ppm
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SAROAD SITE NUMBER; 090020017101 WASHINGTON, O.C.
xsar gAn,Y mm (pw)
1st
2nd
3rd
4th
5 th
1976*
18
10
7
7
7
1978*
18
12
12
10
8
1977
10
9
8
8
8
1978
24
12
12
12
11
1979 -
20
20
15
13
10
1980
16
11
11
10
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•Less than 4000 hourly observations.
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SAROAD SITE NUMBER*. 090020003A10* WASHINGTON, O.C.
(Site B)
im mv mm W)
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1971 24 16 18 15 13
1976 23 18 14 12 11
1977** 10 10 8 7 7
1978 - -« -- - -
1979** 11 9 9 8 8
,¦ 1980 ' ' '
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meet CO siting criteria.
**less than 4000 hourly observations.
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ATLANTA, GEORGIA
AMBIENT AIR QUALITY INFORMATION
• From 1976-1980, 8 sites collected at least 4000 hourly observa-
tions in one or more years. In 1980, 4 sites met this criteria
and all exceeded the 8-hour NAAQS.
• A general decline in CO levels can be seen in both the graphs
of the trends in the annual second maximum 8-hour averages and
the estimated number of exceedances of the 8-hour NAAQS.
• Site E, which has historically recorded some of the highest second
maximum 8-hour average CO levels changed from 17 ppm in 1976 to
10 ppm in 1979 for a decrease of 42%. During this same period,
the estimated number of exceedances decreased from 23 to 4 or 82%.
SITE INFORMATION
ATLANTA, GA (A/B) 11-0200-001-F01 (99 Butler Street, SE)
t Site was a micro scale roadway site located in a center city
commercial area.
• The sampling probe was 3 meters high and setback 5 meters
from the road which had an ADT of 12,000. The nearest intersecting
street was 16 meters away and the ADT was 14,000.
• The site was near a large parking lot and predominantly affected
by backed-up traffic. The site was discontinued in 1980 because
of the undue influence of the stopped traffic.
• The site did not meet the revised major city network design
priorities established by the Regional Office.
ATLANTA. GA (E) 11-0200-003-501 (W. Peachtree Rd. and 14th St.)
• Site is a middle scale street corridor site in a light commercial
and suburban area.
• The probe 1s 3 meters high and setback about 9 meters from the
road. The ADT is about 12,000.
• The site is predominantly influenced by mobile sources and does
meet the siting criteria.
SIP DESIGN VALUE: 22 ppm
-------
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SAROAD SITE NUMBER: 110200003601 ATLANTA, GEORGIA
—m *" 110200003F01* (Site E)
YEAR 8-HOUR AVERAGE DAILY MAXIMA (PPM)
•1st
2nd
3rd
4th
5th
1975
20
19
17
16
14
1976
17
17
16
15
12
1977
16
12
11
11
10
1978
15
13
13
10
10
1979
10
9
9
7
7
1980**
24
20
19
14
14
~Reporting organization changed May 1980.
**Less than 4000 hourly observations*
-------
BOISE, IDAHO
AMBIENT AIR QUALITY INFORMATION
• During the period, 1976-1980, 2 sites collected at least 4000
hourly observations in one or more years. In 1980, these 2
sites met this criteria and both exceeded the 8-hour NAAQS.
• A decrease in CO levels can be seen in both the graphs of the
trends in the annual second maximum 8-hour averages and the
estimated number of exceedances of the 8-hour NAAQS.
t Site A, which recorded the highest second maximum 8-hour average
CO level in 1978-1980, changed from 18 ppm in 1976 to 12 ppm in
1980 for a decrease of 33%. During this same period, the esti-
mated number of exceedances decreased from 151 to 30 or 80%.
SITE INFORMATION
BOISE, ID (A) 13-0220-007-F01 (115 N. 9th)
• This site is a traffic corridor microscale site in the central
business district.
t The monitoring probe is 3 meters high with a setback of 3 meters
from the nearest traffic lane on a street with an ADT of 30,000
vehicles. The site does meet the siting criteria.
• The site is primarily influenced by mobile sources.
SIP DESIGN VALUE: 21 ppm
-------
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SAROAD SITE NUMBER: 1302200Q7F01 BOISE, IDAHO
(Site A)
££& 8-HOUR AVERAGE OAILV MAXIMA (99*)
1st
2nd
3rd
4th
5th
1975*
20
18
18
17
16
1976
20
18
17
16
16
1977
18
18
16
16
15
1978
20
18
16
16
15
1979
18
17
17
14
14
1980
13
12
12
12
11
~less than 4000 hourly observations.
-------
CHICAGO, ILLINOIS
AMBIENT AIR QUALITY INFORMATION
• Sixteen sites collected at least 4000 hourly observations in
one or more years in the period 1976-1980. In 1980, 5 sites
met this criteria and 1 exceeded the 8-hour NAAQS.
t No clear trend in CO levels can be seen in both the graphs of
the trends in the annual second maximum 8-hour averages and the
estimated number of exceedances of the 8-hour NAAQS.
• Site L, which recorded the highest second maximum 8-hour average
CO level in 1977 to 1980, changed from 15 ppm in 1977 to 14 ppm
in 1980 for a decrease of 7%. During this same period, the esti
mated number of exceedances decreased from 106 to 33 or 69%.
SITE INFORMATION
COOK CO., IL (L)14-1220-040-F01 (160 N. LaSalle St.)
• This site 1s a street canyon microscale site located in the
central business district which was established in 1977 to
replace site 14-1220-002—PI0.
t The monitoring probe is 3.5 meters high set back 5 meters from
the nearest traffic lane of a road with an ADT of 13,000. The
site meets all existing siting criteria for a microscale CO.
The site is only influenced by mobile sources.
COOK CO., IL (C) 14-1220-002-P10 (445 S. Plymouth Court)
• This site was a street corridor microscale site in the central
business district of Chicago.
• The monitoring probe was 4 meters high and approximately 7 meters
from the nearest traffic lane. The average dally traffic (ADT)
was 46,000.
• The site was predominantly mobile source oriented.
• The site was discontinued in 1978 due to the planned construfctlon
of a new building.
SIP DESIGN VALUE: 23 ppm
-------
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YEAR
141220002P10*
(Site C)
CHICAGO, ILLINOIS
8-HOUR AVERAGE DAILY MAXIMA (PPM)
1975
1976
1st
23
14
2nd
21
13
3rd
20
12
4th
18
11
5th
17
11
•Site discontinued In 1978 because of planned
demolition of building where site was located.
~~less than 4000 hourly observations.
HISHEST FIVE DAILY 8-HOUR AVERAS1
SAROAP SITE NUMBER; U1220040F01* CHICAGO, ILLINOIS
(Site L)
im
1975
1976
8-HOUR AVERAGE DAILY MAXIMA (PPH)
1st 2nd 3rd 4th 5th
1977
13
13
13
12
12
1977
1(5
15
14
14
14
1978**
11
10
9
8
8
1978
17
16
15
15
14
1979
--
—
—
—
—
1979
16
15
14
14
13
1980
—
—
--
mm
m m
1980
14
14
13
11
11
*S1te not established until 1977.
-------
LOUISVILLE, KENTUCKY
AIR QUALITY INFORMATION
t Over the years, 1976-80, eight sites collected at least 4,000
hourly observations in one or more years. In 1980, four sites
met this criteria and two exceeded the 8-hour NAAQS.
• A general decline in CO levels can be seen in both the graphs
of the trends in the annual second maximum 8-hour averages and
the estimated number of exceedances of the 8-hour NAAQS.
• Site F, which records the highest second maximum 8-hour average
CO levels in 1976, 1977 and 1980, decreased from 19 ppm in 1976
to 13 ppm in 1980 for a decrease of 32%. During this same period,
the estimated number of exceedances decreased from 200 to 27 or
87%.
SITE INFORMATION
LOUISVILLE. KY (F) 18-2380-026-G01 (208 S. 5th Street)
• Site is a traffic corridor microscale NAMS site located in the
commercial area of center city.
• The sampling probe is 3 meters high and setback 3,5 meters
from the street which has an ADT of 15,000. The nearest
intersecting street is about 30 meters away and has an
ADT of approximately 20,000.
§ The site is predominantly influenced by mobile sources and does
meet the siting criteria.
SIP DESIGN VALUE: 20 ppm
-------
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(Site F)
im 8-hour averase pmly hmiha (m)
1st
2nd
3rd
4th
5th
1975
25
24
24
23
23
1976
20
19
19
17
17
1977
20
20
18
18
18
1978
20
11
15
15
15
1979*
12
12
11
10
10
1980
16
13
13
12
12
*L«s$ thin 4000 hourly observations.
-------
SAGINAW, MICHIGAN
AMBIENT AIR QUALITY INFORMATION
• Only one site has measured CO over the period 1976-1980, collecting
at least 4000 hourly observations each year. While the annual
second maximum 8-hour average has declined considerably over the
years, it still exceeds the 8-hour NAAQS.
• Only one site measured CO and it exhibited a decline in both the
annual second maximum 8-hour averages and the estimated number of
exceedances of the 8-hour NAAQS.
• The second maximum 8-hour average decreased from 16 ppm in 1976 to
9 ppm in 1980 for a decrease of 44%. During this same period, the
estimated number of exceedances decreased from 40 to 1 or 98%.
SITE INFORMATION
SAGINAW, MI (A)23-4760-002-F01 (2521 N Washington)
t This site is a neighborhood scale site located in a residential
industrial area.
• Site is influenced by both mobile and point sources.
• The monitoring probe is 4 meters high and 70 meters from the
nearest street with an ADT of 10,000. The Gray Iron Foundry
is 2,000 feet west of the site. In addition, a nodular iron
foundry is located 2,500 north of the site.
t High CO levels at this site seem to occur when the wind blows
from the direction of the foundries, thus it appears that
the foundries are the primary sources effecting this site.
Mobile source emissions are of secondary importance at this
site because of the setback distance from the nearest roadway.
SIP DESIGN VALUE: 22 ppm
-------
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SAROAD SITE NUMBER: 234760002F01 SAGINAW, MICHIGAN
(Sit® A)
YEAR 8-HOUR AVERAGE DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
15
14
13
12
12
1976
17
16
16
14
14
1977
23
18
17
14
12
1978
14
14
13
12
12
1979
12
11
10
10
10
1980
9
9
8
7
7
-------
ST. LOUIS, MISSOURI
AMBIENT AIR QUALITY INFORMATION
• From 1976-1980, 11 sites collected at least 4000 hourly observations
in one or more years. In 1980, 4 sites met this criteria, but only
one exceeded the 8-hour NAAQS.
• A general decline in CO levels can be seen in both the graphs of
the trends in the annual second maximum 8-hour averages and the esti-
mated number of exceedances of the 8-hour NAAQS.
• Site G, which records the highest second maximum 8-hour average CO
levels in 1976, 1978, and 1980 decreased from 24 ppm in 1976 to
14 ppm in 1980 for a decrease of 42%. During this same period,
the estimated number of exceedances decreased from 19 to 7 or 62%.
• Only one of the 3 sites, collecting 4000 or more hourly observations,
recorded exceedances of the 8-hour average NAAQS in 1980.
SITE INFORMATION
ST. LOUIS, MO (G) 26-4280-061-HOI (Shreve & 1-70)
• Site is an atypical site in that it is adjacent to a limited
access interstate freeway, bounded on one side by the fence
at the edge of the freeway property and on the other side
by the state highway commission property fence.
• The site is a middle scale traffic corridor site.
• The monitoring probe is 4.5 meters high and setback 15 meters
from a 93,000 ADT freeway. The site does meet the siting criteria.
• The site is predominantly influenced by mobile sources.
SIP DESIGN VALUE: 14 ppm
-------
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-------
MISSOULA COUNTY, MONTANA
AMBIENT AIR QUALITY INFORMATION
• Over the years, 1976-1980, only 1 site collected at least 4000
hourly observations in one or more years; this only occurred
in 1977. In 1980, no sites met the criteria.
SITE INFORMATION
MISSOULA CO., MT (A) 27-1100-019-F01 (Lions Park at Bancroft and Kent)
• This site is used for special purpose monitoring (SPM) for
pollutants other than CO. A CO monitor was in the shelter
and operated sporadically from 1978-1980. This is reflected
in the number of hourly observations reported, which were
1307 for 1978, 3639 for 1979, and 1869 for 1980.
§ The site is a roadway microscale site located in a residential area.
• The State believes that multiple small area sources (fireplaces)
predominantly influence this site.
• The inlet probe is approximately 3.5 meters high and 5 meters
from a road of 7,800 ADT.
• The location meets the siting criteria for a microscale site.
MISSOULA, MT 27-1080-003-F01 (Malfunction Junction)
• CO was monitored at this site until 1978 and then moved across
the street due to lease problems. The SAROAD for the new
site across the street is 27-1080-005-F01. Data for the
new site was submitted to NADB but never entered because of
a computer error.
• Both sites were located in a central business district.
• The inlet probe for the 27-1080-003-F01 site was 3 meters high
and 3 meters from a road of 20,350 ADT. The new site is also
3 meters high but 15 meters from the same road.
• Both sites were predominantly influenced by mobile sources.
• The 003 site met the siting criteria for a microscale site and
the 005 site meets the siting criteria for a middle scale site.
SIP DESIGN VALUE: 20 ppm
-------
MISSOULA MT
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HAXIMUH t6 c5wCENtftATi6NS
SAROAD SITE NUMBER: 271100019F01* MISSOULA COUNTY, MONTANA
YEAR 8-HOUR AVERAGE DAILY MAXIMA (PPM)
1st 2nd 3rd 4th 5th
HIGHEST FIVE DAILY 8-HOUR AVERAGE
MAXIMUM CO CONCENTRATION?
SAROAD SITE NUMBER: 271080003F01* MISSOULA, MONTANA
(Site A)
8-HOUR AVERAGE OAILY MAXIMA (PPM)
1st 2nd 3rd 4th 5th
YEAR
1975
1975
1976
1976
..
—
--
—
—
1977
—
—
—
--
—
1977
26
22
20
18
18
1978
16
16
15
15
15
1978**
22
19
18
17
17
1979
17
14
13
12
11
1979
—
—
—
—
1980
11
10
7
7
7
1980
—
--
—
—
—
*S1te not established until 1978, and reported less
than 4000 hourly observations per year.
•Site not established until 1977 and discontinued
1n 1978.
**Less than 4000 hourly observations.
-------
LINCOLN, NEBRASKA
AMBIENT AIR QUALITY INFORMATION
• Two sites collected at least 4000 hourly observations in one or more
years during 1976-1980. In 1980, one site exceeded the 8-hour NAAQS
and the other did not.
• The two sites measuring CO in Lincoln, Nebraska (Sites A and B),
show declines in both the annual second maximum 8-hour averages
and the estimated number of exceedances.
• The second maximum 8-hour average concentration at Site A, which has
the longest history of data, decreased from 18 ppm in 1976 to 10 ppm
in 1980 for a decrease of 44%. During this same period, the esti-
mated number of exceedances decreased from 19 to 3 or 83%.
§ Only Site A exceeds the 8-hour NAAQS in 1980.
SITE INFORMATION
LINCOLN, NE (A) 28-1560-007-G01 (2215 '0' Street)
• Site was a suburban commercial traffic corridor microscale site.
• The monitoring probe was 3 meters high and setback 4 meters from
a 22,000 ADT road.
• In 1980, the monitoring probe was moved to 5.5 meters high with a
setback of 14 meters from the same road. This change moves the
site classification to middle scale.
• The site is predominantly influenced by mobile sources.
SIP DESIGN VALUE: 12 ppm
-------
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HIGHEST FIVE DAILY 8-HOUR AVERAGE
MAXIMUM CO CONCENTRATIONS
SAROAD SITE NUMBER; 281560007G01 LINCOLN, NEBRASKA
{Site A)
YEAR 8-HOUR AVERA6E DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
17
17
15
15
14
1976
19
18
15
14
13
1977
28
14
14
13
13
1978
17
13
12
12
12
1979
11
9
9
9
8
1980
11
10
9
9
8
-------
CAMDEN, NEW JERSEY
AMBIENT AIR QUALITY INFORMATION
• Three sites collected at least 4000 hourly observations in one
or more years during the period 1976-1980. In 1980, 2 sites met
this criteria and neither exceeded the 8-hour NAAQS.
ff A general decline in CO levels can be seen in both the graphs of
the trends in the annual second maximum 8-hour averages and the
estimated number of exceedances of the 8-hour NAAQS.
• Site A, which recorded the highest second maximum 8-hour average
CO level from 1976 to 1980 changed from 14 ppm in 1976 to 5 ppm
in 1980 for a decrease of 62%. During this same period, the esti-
mated number of exceedances decreased from 10 to 0.
SITE INFORMATION
CAMDEN, NJ (A) 31-0720-003-F01 (Copewood and Davis Street)
• Site is a neighborhood scale site located in a residential area,
t Site is primarily influenced by mobile sources.
• The probe is 5 meters high and 150 meters from a road of 3,000
ADT and 430 meters from a road of 14,000 ADT. The site meets
siting criteria.
SIP DESIGN VALUE
An annual average of 2.1 ppm to be compared to a statistically derived
annual average of 1.5 ppm for the entire State of New Jersey. The NJ
value of 1.5 ppm assumes that any annual average at or below this level
could be expected to meet the 8-hour CO NAAQS.
-------
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HIGHEST FIVE DAILY 8-HOUR AVERAGE
MAXIMUM CQ CONCENTRATIONS
SAROAO SITE NUMBER: 310720Q03F01 CAMDEN. NEW JERSEY
(Site A)
YEAR 8-HOUR AVERAGE DAILY MAXIMA (PPM1
1st
2nd
3rd
4th
5 th
1975
21
16
12
12
11
1976
14
14
12
10
10
1977
14
14
9
8
6
1978
12
12
9
8
8
1979
10
9
8
8
7
1980
6
5
5
5
4
-------
HUDSON COUNTY, NEW JERSEY
AMBIENT AIR QUALITY INFORMATION
• From 1976-1980, 2 sites collected at least 4000 hourly observations
in one or more years. In 1980, both sites rtiet this criteria and
1 exceeded the 8-hour NAAQS.
• A decline in CO levels can be seen in both the graphs of the trends
in the annual second maximum 8-hour averages and tne estimated
number of exceedances of the 8-hour NAAQS,
• Site B, which recorded the highest second maximum 8-hour average
CO level in 1976-1980, changed from 19 ppm in 1976 to 11 ppm in
1980 for a decrease of 39%. During this same period, the estimated
number of exceedances decreased from 249 to 11 or 96%.
• During the winter of 1979-1980, a special monitoring study was
conducted at sites believed to experience higher ambient levels
of CO than was normally measured at established monitoring sites.
On the basis of three fixed 8-hour periods, the second highest
8-hour concentration at a site on J.F. Kennedy Boulevard was 15.7 ppm.
This value was approximately 30% higher than that measured at Site B.
SITE INFORMATION
HUDSON CO. (JERSEY CITY), NJ (B) 31-2320-002-F01 (2828 Kennedy Blvd.)
• Site is located in a central business district.
• Site is dominated by mobile source emissions.
• The probe is 3 meters high and 6 meters from a road of 25,000 ADT,
• This is a NAMS microscale site and meets the siting criteria.
SIP DESIGN VALUE
An annual average of 4,1 ppm to be compared to a statistically derived
annual average of 1.5 ppm for the entire State of New Jersey. The NJ
value of 1.5 ppm assumes that any annual average at or below this level
could be expected to meet the 8-hour NAAQS.
-------
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MMMUMfcft tONCENTRATIONS
SARQAD SITE NUMBER: 312320002F01 JERSEY CITY, NEW JERSEY
(Site B)
YEAR 8-HOUR AVERA6E DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
23
21
21
20
20
1976
20
19
18
18
17
1977
21
20
16
16
15
1978
14
13
12
12
12
1979
11
10
10
10
10
1980
12
11
10
10
10
-------
MORRIS COUNTY, NEW JERSEY
AMBIENT AIR QUALITY INFORMATION
• Over the years, 1976-1980, 2 sites collected at least 4000
hourly observations in one or more years. In 1980, only 1
site met this criteria and it exceeded the 8-hour NAAQS.
• A decline in CO levels can be seen in both the graphs of the
trends in the annual second maximum 8-hour averages and the
estimated number of exceedances of the 8-hour NAAQS.
• Site A, which monitored in 1976 and 1977 changed its second
maximum 8-hour average CO from 22 ppm in 1976 to 21 ppm in 1977
for a decrease of 5%, During this same period, the estimated
number of exceedances decreased from 238 to 130 or 4-5%.
• Site B, which monitored from 1978 through 1980, produced a change
in the second maximum 8-hour average CO level from 16 ppm in 1978
to 9 ppm in 1980 for a decrease of 43%. During this same period,
the estimated number of exceedances decreased from 114 to 6 or 95%.
• A special monitoring study was performed during the winter of 1979-
1980 at sites believed to experience higher ambient levels of CO
than is normally measured at the established monitoring sites. Based
on 3 fixed 8-hour periods, the second highest 8-hour concentration
measured on Speedwell Ave., Morristown, NJ was 11.3 ppm. This value
was approximately the same as the second highest 8-hour concentration
measured at Site B in 1980.
SITE INFORMATION
MORRIS CO., NY (A1
31-33CQ-001-FG1
- B
31-3300-003-F01
• Data from 31-3300-001-F01 from April 1973-1977 was miscoded
and should have been coded as 31-3300-003-F01, Data from 1978-
present is properly coded.
• Site is located in the central business district.
• Site is influenced by mobile sources.
t The probe is 8 meters high and 4-5 meters from a road (no
estimate of traffic available).
• The site does not meet the siting criteria for a microscale site
because the probe is too high.
SIP DESIGN VALUE
An annual average of 3.9 ppm to be compared to a statistically derived
annual average of 1.5 ppm for the entire State of NJ. The NJ value of
1.5 ppm assumes that any annual average at or below this level could
be expected to meet the 8-hour CO NAAQS.
-------
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(Site B)
YEAR 8-HOUR AVERA6E DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
26
24
22
20
20
1976
24
22
22
20
18
1977
23
21
17
17
17
1978
18
14
14
14
14
1979
10
9
9
9
9
1980
13
12
11
10
10
•Data for Site 313300003F01 from April 1973-1977 was
miscoded Into Site 313300001F01.
-------
UNION COUNTY, NEW JERSEY
AMBIENT AIR QUALITY INFORMATION
• Two sites collected at least 4000 hourly observations in one
or more years during 1976-1980. In 1980, both sites met this
criteria and neither exceeded the 8-hour NAAQS.
• A decline in CO levels can be seen in both the graphs of the
trends in the annual second maximum 8-hour averages and the
estimated number of exceedances of the 8-hour NAAQS.
• Site A, which recorded the highest second maximum 8-hour average
CO level from 1976 to 1980, changed from 17 ppm in 1976 to 9 ppm
in 1980 for a decrease of 46%. During this same period, the
estimated number of exceedances decreased from 126 to 0.
• A special monitoring study was performed during the winter of
,1979-1980 at sites believed to experience higher ambient levels
of CO than is normally measured at the established monitoring
sites. On the basis of 3 fixed 8-hour periods, the second highest
8-hour concentration measured in Elizabeth on Broad St, near the
intersection of Westfield was 15.7 ppm. This value was approximately
44% higher than that measured at Site A.
SITE INFORMATION
UNION CO., (ELIZABETH) NJ(A)31-1300-003-F01 (7 Broad Street)
• Site is a street canyon site located in the central business district.
• Site is predominantly influenced by mobile sources.
• The probe is 5 meters high and 5 meters from a road (no estimate
of traffic available).
• The site does not meet the microscale siting criteria because
the probe is too high. In addition, it is too close to the
intersection.
SIP DESIGN VALUE
An annual average of 3.5 ppm to be compared to a statistically derived
annual average of 1.5 ppm for the entire State of NO. The NO value of
1.5 ppm assumes that any annual average at or below this level could
be expected to meet the 8-hour CO NAAQS.
-------
8
UNION CO. NJ
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SAROAD SITE NUMBER; 311300003F01 ELIZABETH, NEW JERSEY
(Site A)
YEAR 8-HOUR AVERAGE DAILY MAXIMA fPPHl
1st
2nd
3rd
4th
5th
1975
21
18
17
16
16
1976
18
17
16
16
16
1977
23
19
19
17
17
1978
14
12
12
12
12
1979
9
9
9
9
9
1980
9
9
8
8
8
-------
ALBUQUERQUE, NEW MEXICO
AMBIENT AIR QUALITY INFORMATION
• From 1976-1980, 6 sites collected at least 4000 hourly observations
in one or more years. In 1980, 3 sites met this criteria and all
exceeded the 8-hour NAAQS.
• Site B recorded the highest second maximum 8-hour average CO levels
between 1977 and 1979. In 1980, only 2400 hourly observations were
reported which gives an approximate value of 13 ppm.
• Between 1977 and 1979, the second maximum 8-hour average CO levels
at Site B decreased from 22 to 21 ppm or 4%. During this same period,
the estimated number of exceedances of the 8-hour NAAQS decreased from
54 to 40 or 27%.
• All 3 of the sites, collecting 4000 or more hourly observations exceeded
the 8-hour NAAQS in 1980.
SITE INFORMATION
ALBUQUERQUE, NM (B) 32-0040-009-H01 (Indian School Rd)
• Site is a suburban commercial neighborhood scale site.
• The monitoring probe is 4 meters high and setback 35 meters
from an 11,000 ADT road. Site meets siting criteria.
• The site is predominantly influenced by mobile sources.
ALBUQUERQUE. NM (F) 32-0040-019-H01 (2421 Mesilla Ave.)
t Site is a neighborhood scale residential site.
• The monitoring probe is 3.5 meters high and setback 12.5 meters
from a 300 ADT road and meets the siting criteria.
t The site is predominantly influenced by mobile sources.
SIP DESIGN VALUE: 22 ppm
-------
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SAROAD SITE NUMBER: 320040009H01
(Site B)
ALBUQUERQUE. NEW MEXICO
YEAR
8-HOUR AVERAGE DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
30
27
26
26
25
1976*
30
21
20
19
17
1977
22
22
22
21
20
1978
30
20
19
13
12
1979
25
21
21
20
20
1980*
20
13
13
10
9
•Less than 4000 hourly observations.
-------
ROSMELL, NEW MEXICO
AMBIENT AIR QUALITY INFORMATION
• Over the years, 1976-1980, only 1 site collected at least 4000
hourly observations in one or more years. In 1979 or 1980, no
sites were operating.
SITE INFORMATION
ROSWELL, NM (A) 32-0960-002-F01 (2nd and Main)
t Site was a special study site at the request of the State Highway
Commission. The site did not meet siting criteria and was
discontinued after 4 months. The site was located in a parallel
parking strip adjacent to a median strip of a divided road.
• The monitoring probe was positioned at tail pipe level about
0.3 meters high and was only setback about 0.5 meters from
the traffic lane.
• The high and 2nd high hours of 60 and 30 ppm were keypunch
errors and should be 6 and 3 ppm respectively. This will also
change the 1st and 2nd maximum 8 hour levels as the 60 ppm value
was included in each.
SIP DESIGN VALUE: 17 ppm
-------
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SAROAD SITE NUMBER: 320960002F01* ROSWELL, NEW MEXICO
YEAR 8-HOUR AVERASE DAILY MAXIMA (PPM)
1st 2nd 3rd 4th 5th
1975 19 18 16 16 16
1976
1977
1978
1979
1980
•Site collected less than 4000 hourly observations
-------
NEW YORK, NEW YORK
AMBIENT AIR QUALITY INFORMATION
• In the period 1976-1980, 22 sites collected at least 4000 hourly
observations in one or more years. In 1980, 7 sites met this cri-
teria but only 2 exceeded the 8-hour NAAQS.
• A general decline in CO levels can be seen in both the graphs of
the trends in the annual second maximum 8-hour averages and the
estimated number of exceedances of the 8-hour NAAQS.
• Site S, which records the highest second maximum 8-hour average CO
levels in both 1979 and 1980, decreased from 19 ppm in 1976 to 15 ppm
in 1980, or 21%. During this same period, the estimated number of
exceedances of the 8-hour NAAQS decreased from 374 to 131, or 65%.
• Only 2 of the sites collecting 4000 or more hourly observations,
recorded exceedances of the 8-hour average NAAQS in 1980.
SITE INFORMATION
NEW YORK, NY(P)33-4680-023-H01 (59th Street and Bridge Place)
• This site was operated by New York City until 1976 when their
air monitoring program was discontinued. New York State chose
not to continue operating the site because it was not sited in a
populated area.
• The probe was 2 meters high and about 2 meters from the on-off
ramps for the Queensboro Bridge. The bridge traffic of 100,000
ADT plus the traffic from the on-off ramps influenced concentrations
at this site. The inlet probe was located in the median strip
between the on-off multiple lane ramps.
• The site was influenced by mobile sources.
• This site did not meet the siting criteria for a microscale site
because the probe was too low and too close to the shelter. In
addition, it was unacceptable because of the median strip location.
NEW YORK, NY(S)33-4680-058-F01 (110 E. 45th Street)
t Site is a street canyon site located in the central business
district.
• Site is predominantly influenced by mobile sources.
• The probe is 3 meters high and 5 meters from a road of 9,000 ADT.
t This is a NAMS microscale site and meets the siting criteria.
SIP DESIGN VALUE: 24 ppm
-------
NEw YORK CITY
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SARQAD SITE NUMBER: 334680058F01 NEW YORK CITY. NEW YORK
(Site S)
YEAR 8-HOUR AVERA6E DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
24
23
21
19
19
1976
26
18
18
16
15
1977
21
16
15
15
15
1978
17
16
16
15
15
1979
17
17
15
15
14
1980
IS
15
14
14
14
-------
DAYTON, OHIO
AMBIENT AIR QUALITY INFORMATION
• Four sites collected at least 4000 hourly measurements in one or
more years between 1976-1980. In 1980, only one site met this
criteria and it exceeded the 8-hour NAAQS.
• Two sites, B and D, show decreasing levels over time. Site D
recorded the highest second maximum 8-hour average levels in 1976
and 1977, while Site B recorded the highest levels in 1979 and 1980,
both of which were below the 8-hour NAAQS.
• Between 1976 and 1978, the second maximum 8-hour average CO levels
at Site D decreased from 13.5 to 9.4 ppm or 30%. During this same
period, the estimated number of exceedances of the 8-hour NAAQS
decreased from 20 to 3 or 84%.
• Site B decreased from 8 to 7 ppm or 13% between 1979 and 1980.
There were no exceedances of the standard in either year.
SITE INFORMATION
DAYTON, OH (D)36-1660-026-G01 (117 S Main)
• This site was a middle scale site in the central business district
of Dayton. The probe height was 10.7 meters and the setback
distance was 3 meters from a street with an ADT of 20,000 vehicles.
• The site was predominantly influenced by mobile sources.
t This site did meet the middle scale siting criteria but was
discontinued as a result of building renovation at the site
in 1978.
DAYTON. OH(B)36-166Q-003-G01 (7 E 4th Street)
• This site is a microscale site located in the central business
district to replace site 36-1660-026-G01 previously located in
the same area.
• The monitoring probe is 3.5 meters high with a setback of 7 meters
from the nearest traffic lane on a street with an ADT of 12,000.
This site does meet the siting criteria.
• The site is primarily influenced by mobile sources.
SIP DESIGN VALUE: 23 ppm
-------
DAYTON OH
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SAROAD SITE NUMBER:
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(Site B)
ST
DAYTON, OHIO
*S1te not established until 1978.
•~Less than 4000 hourly observations
HIGHEST FIVE DAILY 8-HOUR AVERAGE
MAXIMUM CO CQNCgNtftAtlONS
DAYTON, OHIO
YEAR
8-HOUR AVERAGE DAILY MAXIMA (PPM)
YEAR
1st
2nd
3rd
4th
5th
1975
1975
1976
1976
1977
—
—
—
—
1977
1978**
16
9
9
8
7
1978
1979
8
8
7
7
7
1979
1980
7
6
6
6
5
1980
SAROAD SITE NUMBER: 361660026G01*
(Site 0)
8-HOUR AVERAGE DAILY MAXIMA (PPM)
1st
20
16
16
10
~Site was discontinued because of major renovation
on the building where the site was located.
2nd
3rd
4th
5th
20
15
15
14
14
12
12
11
15
10
8
8
9
8
8
7
-------
PORTLAND, OREGON
AMBIENT AIR QUALITY INFORMATION
• Four sites collected at least 4000 hourly measurements in one or
more years from 1976-1980. In 1980, 4 sites met this criteria and
all of them exceeded the 8-hour NAAQS.
• Site A yields the highest second maximum 8-hour average CO levels
in 4 out of 5 years.
• Between 1976 and 1980, the second maximum 8-hour average CO level
at Site A decreased from 14 to 12 ppm or 14%. The decrease in the
estimated number of exceedances of the 8-hour standard decreased
more sharply from 41 to 20 or 52% during this same period.
• While there is little change in the second maximum CO levels among
Sites A, B, and C, with a 5-year history of data, there are sub-
stantial decreases in the estimated number of exceedances of the
8-hour standard at each of the sites.
SITE INFORMATION
PORTLAND, OR (A) 38-1460-002-F01 (718 W. Burnside)
• This site is a street canyon microscale site located in a
commercial area of the central business district.
t The monitoring probe is 3 meters high with a setback of 10
meters from the nearest lane on a street with an ADT of 31,000
vehicles. The site does meet the siting criteria.
• The site is principally influenced by mobile sources.
PORTLAND, OR (C)38-1460-078-F01 (Newberry's Co. SW 5th)
• This site is a street canyon microscale central business district
site.
• The monitoring probe is 3.7 meters high with a setback of 5.6
meters from the nearest traffic lane on a street with an ADT of
14,500 vehicles. The site does meet the siting criteria.
• This site is primarily influenced by mobile sources.
SIP DESIGN VALUE: 17 ppm
-------
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MAXIMUM CO CONCENTRATIONS
SAROAD SITE NUMBER; 381460002F01 PORTLAND. OREGON
(Site A)
YEAR 8'HOUR AVERAGE DAILY MAXIMA (PPM)
1st
2nd
3rd
4th
5th
1975
19
19
18
18
18
1976
16
14
14
14
13
1977
15
15
15
14
14
1978
14
13
13
13
12
1979
21
17
14
13
12
1980
14
12
12
11
11
-------
PITTSBURGH, PA/ALLEGHENY CO.
AMBIENT AIR QUALITY INFORMATION
t During the period, 1976-1980, 4 sites collected at least 4000
hourly measurements in one or more years. In 1980, 3 sites met
this criteria.
• Two sites exceeded the 8-hour standard in 1980. One site, the
Courthouse site (Site B), is properly sited and has been designated
as a NAMS. The second site, the bus stop site (Site C) was not
properly sited, with the monitoring probe located too near the bus
stop.
9 All 3 monitoring sites (B, C, and D) with 2 or more years of data
declined over time.
• The Courthouse site (Site B) shows a 35% decrease in the second
high 8-hour average concentration from 17 ppm in 1976 to 11 ppm
in 1980. During this same period, the estimated number of exceed-
ances of the 8-hour standard decreased from 46 to 7 for a decrease
of 84%.
SITE INFORMATION
PITTSBURGH,PA (C) 39-7260-025-G01 (5th and Liberty Avenue)
t Site is located in the central business district.
• Site is predominantly influenced by mobile sources. Traffic
is frequently stop-and-go in this area. Sampling probe is
located directly above buses discharging and loading passengers.
• The probe is approximately 4 -5 meters high and 2-3 meters from
the road of 25,000 ADT (estimated).
t The inlet probe was moved across the street in May 1981 and
data was miscoded from then through June 30, 1981. Dual
sampling on both sides of the street was begun in the fall
of 1981 and preliminary analysis shows much lower concentrations
at the new site across the street. The probe inlet across the
street is adjacent to an open park land.
• Neither sampling probe location meets the siting criteria because
of closeness to an Intersection and height above ground.
PITTSBURGH, PA (B)39-7260-005-G01 (Forbes and Grant Ave.)
• Site is located in the central business district in a street canyon.
§ Site is primarily influenced by mobile source emissions.
• The probe is 3 meters high and 5 meters from a road of 15,000 ADT.
• This is the NAMS microscale site and meets the siting criteria.
SIP DESIGN VALUE: 24 ppm
-------
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SAROAD SITE NUMBER: 397260005G01 PITTSBURGH. PENNSYLVANIA
(Site B)
YEAR 8-HOUR AVERA6E DAILY MAXIMA (PPH1
1st 2nd 3rd 4th 5th
1975 21 21 18 17 16
1976 18 17 14 14 14
1977 15 15 13 13 12
1978 20 17 15 13 12
1979 15 13 13 10 10
1980 13 11 11 10 9
-------
SPOKANE, WASHINGTON
AMBIENT AIR QUALITY INFORMATION
• Over the years, 1976-1980, four sites collected at least 4000 hourly
measurements in one or more years. In 1980, 2 sites met this cri-
teria and both exceeded the 8-hour NAAQS.
• Two sites, C and D, show decreasing CO levels over time. Site C
recorded the highest CO levels in 1976, while Site D recorded the
highest levels in 1980.
t Between 1976 and 1978, the second maximum 8-hour average CO levels
at Site C decreased from 19 ppm to 16 ppm or 16%. During this same
period, the estimated number of exceedances of the 8-hour standard
decreased from 181 to 113 or 38%.
• Site D decreased from 14 ppm to 11 ppm or 21% between 1979 and 1980.
The estimated number of exceedances of the 8-hour standard decreased
from 22 to 10 or 52%.
SITE INFORMATION
SPOKANE, WA (C) 49-2040-023-F01 (W 612 Sprague)
• This site was a microscale roadway site in the central business
district of Spokane. The site was discontinued in 1978 due to
the demolition of the building.
• The probe was 3.2 meters high with a setback of 4.5 meters from
the nearest traffic lane of a street with an ADT of 7,700 vehicles.
• The site was predominantly influenced by mobile sources.
SPOKANE, MA (D) 49-2040-027-F01 (W 710 Sprague)
• This site is a microscale roadway site in the central business
district established to replace site 49-2040-023-F01 which was located
in the same general area,
• The monitoring probe is '3.1 meters high with a setback of 4.6
meters from the nearest traffic lane on a street with an ADT
of 9,100 vehicles. The site meets the siting criteria.
• This site is principally influenced by mobile sources.
SIP DESIGN VALUE: 22 ppm
-------
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------- |