EPA-600/4-77-013
February 1977
Environmental Monitoring Series
CARBON MONOXIDE LEVELS IN CHARLOTTE,
NORTH CAROLINA
Environmental Monitoring and Support Laboratory
Office of Research and Development
U.S. Environmental Protection Agency
Las Vegas, Nevada 89114
-------
RESEARCH REPORTING SERIES
Research reports of the Office of Research and Development, U.S. Environmental
Protection Agency, have been grouped into five series. These five broad
categories were established to facilitate further development and application of
environmental technology. Elimination of traditional grouping was consciously
planned to foster technology transfer and a maximum interface in related fields.
The five series are:
1. Environmental Health Effects Research
2. Environmental Protection Technology
3. Ecological Research
4. Environmental Monitoring
5. Socioeconomic Environmental Studies
This report has been assigned to the ENVIRONMENTAL MONITORING series.
This series describes research conducted to develop new or improved methods
and instrumentation for the identification and quantification of environmental
pollutants at the lowest conceivably significant concentrations. It also includes
studies to determine the ambient concentrations of pollutants in the environment
and/or the variance of pollutants as a function of time or meteorological factors.
This document is available to the public through the National Technical Informa-
tion Service, Springfield, Virginia 22161.
-------
EPA-600/4-77-013
February 1977
CARBON MONOXIDE LEVELS
IN CHARLOTTE, NORTH CAROLINA
by
Norman E. Hester
Monitoring Operations Division
Environmental Monitoring and Support Laboratory
Las Vegas, Nevada 89114
and
John Prince
Lockheed Electronics Company, Inc.
4220 S. Maryland Parkway
Las Vegas, Nevada 89109
U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
ENVIRONMENTAL MONITORING AND SUPPORT LABORATORY
LAS VEGAS, NEVADA 89114
-------
DISCLAIMER
This report has been reviewed by the Environmental Monitoring and Support
Laboratory-Las Vegas, U.S. Environmental Protection Agency, and approved for
publication. Mention of trade names or commercial products does not constitute
endorsement or recommendation for use.
ii
-------
INTRODUCTION AND SUMMARY
A review of the air quality data for Charlotte, North Carolina, taken over
the last 3 years (1973-1976)-has shown excessively high ambient carbon monoxide
readings. Carbon monoxide levels exceeding the Federal 8-hour average standard
were a regular occurrence. The Region IV office of the U.S. Environmental Pro-
tection Agency requested assistance from the Monitoring Operations Division of
the Environmental Monitoring and Support Laboratory in Las Vegas, Nevada, to
determine if the elevated carbon monoxide concentrations are indicative of an
area-wide problem or of a localized "hot spot," and to determine if a more com-
prehensive study designed to collect enough data for modeling the area is
necessary.
Arrangements were made by the Environmental Health Division of the Mecklen-
burg County Health Department for four sampling locations. The positions of
the four temporary sampling locations and the position of the County station
are shown in Figure 1. Personnel and equipment were deployed from Las Vegas
during the second and third weeks of April 1976, and data collection began on
April 21. Problems were encountered with controlling the temperature at some
of the sampling locations and this in turn caused problems with the air monitors.
It was necessary to replace two carbon monoxide monitors with instruments that
were less temperature sensitive. Overall, at least 16 days of data were taken
at each site that could be compared with data at the County site. Wind speed
and direction data were obtained from the U.S. Weather Service station near
Douglas Municipal Airport. Data collection ceased on May 20. Hourly averages
and maximum 8-hour averages have been prepared, and are analyzed in the body
of this report.
-------
CONCLUSIONS AND RECOMMENDATIONS
The maximum 8-hour averages of carbon monoxide data collected at the
County station were found to be higher than those collected at the four tempo-
rary sites by factors of 1.4, 1.6, 2.7, and 3.3. Based on these data, it is
concluded that the carbon monoxide readings reported by the Mecklenburg County
Station are not representative of the metropolitan area of the city of
Charlotte.
Monthly maximum carbon monoxide concentrations seem to have followed a
decreasing trend since mid-1973; however, further monitoring is necessary to
confirm if such a trend exists or if the decreases were caused by some short
term changes in meteorology.
Since the data reveal that the Mecklenburg County station is situated at
a "hot spot," a more comprehensive study designed to collect data over the
greater metropolitan area and to model the carbon monoxide distribution seems
unnecessary. Rather, efforts should be directed toward characterizing and
controlling the "hot spot."
The data taken by the County station should not be considered represen-
tative for the city of Charlotte. A better picture of carbon monoxide con-
centrations in the metropolitan area can be obtained by dividing the County
readings by a factor between 1.4 and 3.4; a rough approximation would be to
divide by 2. This type of approximation should only be applied to old data and
where no other monitoring data exist. The only valid method to obtain carbon
monoxide data that are truly representative of the city is for the County to
add additional monitoring sites.
-------
EXPERIMENTAL PROCEDURES
Equipment
Four Beckman/Andros 7000 Dual-Isotope Fluorescence carbon monoxide (CO)
monitors were deployed for the study. Hewlett-Packard/Moseley 680 recorders
were used to collect the data. Problems with zero drift appeared during
the first week of set up with two of the Beckman/Andros carbon monoxide
monitors, and these two instruments were replaced with Bendix 8501 infrared
carbon monoxide analyzers.
Calibration and Standards
Each monitor was zeroed and spanned every week day during the study.
Zero readings were obtained from catalytic scrubbers until May 13, 1976,
when a zero air cylinder was obtained from EPA-Athens, Georgia. The zero
air cylinder was compared to the zero air obtained from each of the scrub-
ber systems. The commercial zero air cylinder was found to have a concen-
tration of 0.7 parts per million (ppm) of carbon monoxide contaminant.
The proper corrections were made to the data collected by the temporary
monitoring stations. Zero drift was assumed to be linear between calibra-
tions and the appropriate correction was applied to each hourly average.
The span of each instrument was checked at the same time that the
zero was adjusted. Span drift was generally less than 2 percent of full
scale. The span value used for calculating concentrations was the average
of the readings taken before and after each day's sampling period.
A cross-calibration quality control check was performed on each of
the four temporary monitors on April 29-30, 1976 by EPA-Athens, Georgia.
The commercial standard used by the Athens lab was rated at 9.5 parts per
million, the cross check on each of the four temporary monitors using the
span factors calculated from the commercial standard used by Las Vegas
produced values of 9.5, 9.6, 9.5, and 9.4. The agreement was remarkably
good; however, the commercial standard used by Las Vegas was subsequently
compared to a National Bureau of Standards Standard Reference Material and
found to be 2.5 percent high. The data for the four temporary stations are
corrected to the NBS values. The values reported by the County are referenced
to the Region IV standard. The net effect would be to introduce an impre-
cision between the two sets of data of 2.5 percent.
The errors introduced by inaccurate standards coupled to errors
introduced in making zero baseline corrections result in an estimated
precision between the EPA data and the county data of ± 5 percent.
-------
Sampling Locations and Procedures
The carbon monoxide monitors were set up at sites arranged by the
Mecklenburg County Health Department. Three county fire stations and a
local court house were used as sampling sites. The instruments were set
up on the second floor of each building and teflon sampling lines were
run to the outside of the buildings. The intake port of the sampling lines
were situated 3 meters above the ground and 1.5 meters away from the
wall of the building. The locations of all sampling stations, both the
temporary stations and the permanent county stations, are shown in Figure 1.
Meteorological Data
Hourly surface weather conditions were furnished by the National
Weather Service. The data were taken at Douglas Municipal Airport in
Charlotte, North Carolina, which is 8.8 kilometers 261° from true north
from the County monitoring station. The wind speed is recorded in the
appendices in knots, as given by the National Weather Service (1 knot =
1.85 kilometers per hour). The reported data were taken at five minutes
before the hour and are not hourly averages.
Figure 1. Location of Sampling Stations in the Central Charlotte Area.
-------
RESULTS
The hourly averages of carbon monoxide concentration for the four
temporary monitoring stations and the County station are summarized in the
Appendix. Hourly wind speed and direction readings are also given. The
maximum 8-hour average concentrations and the time period covered during
the 8 hours were calculated and are summarized in the Appendix.
A comparison of the maximum 8-hour average times is quite interesting.
Typically, the four temporary sites had their maximum weekday 8-hour averages
in time periods centered around either the morning or evening rush hour
traffic. The highest readings at the County station, however, often occurred
after the morning rush period and before the evening rush. The County
station showed rapid increases in carbon monoxide concentration due to
heavy morning and evening rushes, but the traffic patterns throughout the
midday seem to be extremely high. The County station has its probe
located approximately 3 meters above the sidewalk next to a busy downtown
street. The street is bordered by banks, stores, and other office buildings
which one might expect to draw a lot of midday business. Additionally,
tall buildings around the sampling site would tend to prevent ventilation
of the pollutants. The net effect would seem to result in the midday values.
The direction of the wind seems to have an effect on the concentration
of carbon monoxide at the County station. The highest 8-hour averages at
the County station (April 23, 30, May 10, and 17) occurred when the wind
was blowing from the southwest. The monitor is situated next to a street
that runs southwest-northeast. In other words, the highest values occur
when the wind is blowing along the street.
The maximum 8-hour averages from the four temporary sites and the
County site are summarized in Table 1 by date. By examining days when
each of the temporary stations had data in common with the County station,
it is possible to quantify the amount of bias in the data due to the site
location. Fire Station 1 had 22 days of data in common with the County
station. Fire Station 2 and the court house each had 17 days of data in
common with the County station, and Fire Station 4 had 16 days in common
with the County station.
Averages of the maximum 8-hour averages were prepared for each station
and foe the County station for the days when the stations had data in common.
These averages and the ratios are presented in Table 2. The maximum 8-hour
average carbon monoxide concentrations at the County station are 1.4 times
as high as those at the temporary site in Fire Station 1. The County station
data ajre 3.4 times as high as the data at Fire Station 2, 2.7 times as high
as data from Fire Station 4 and 1.6 times as high as the data from the court
house site. From these ratios, it must be concluded that the carbon monoxide
readings reported for the past few years are not representative of the city
-------
CO
o
o
o
o
oc
o
C3
24
22
20
18
16
14
12
10
8
6
4
2
LEAST SQUARES FIT
FEDERAL STANDARD^
10 mg/m3
OF DATA
I
JJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJ
1973 1974 1975 1976
MONTH
Figure 2. Maximum 8-huur Carbon Monoxide Conrenfrn (: i nns hv MonLti
-------
TABLE 1. MAXIMUM 8-HOUR AVERAGES (mg/m3)
Dates Fire Station Fire
(1976)
April:
22
23
24
25
26
27
28
29
30
May:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
-
5.5
3.2
0.9
2.7
4.0
3.6
4.7
2.6
2.3
2.4
3.0
3.7
1.4
-
-
3.6
2.9
3.8
3.3
6.8
-
4.0
3.0
1.3
3.0
3.0
2.8
3.7
Station
2
-
-
-
-
-
1.2
1.2
2.2
1.1
1.7
1.6
1.1
1.5
0.5
-
1.1
3.7
1.9
1.3
-
-
-
0.6
1.3
0.8
1.2
1.0
1.6
2.2
TABLE 2. AVERAGE OF MAXIMUM 8-HOUR
Temporary
Location
Fire Station
Fire Station
Fire Station
Station
Concentration
1 3.3
2 1.4
4 1.8
•j i
Fire Station Court
4
-
-
-
-
-
-
-
-
-
1.0
0.9
1.1
0.9
1.3
1.7
1.7
2.1
1.5
2.4
2.1
-
3.3
2.4
1.6
1.3
2.4
2.4
2.0
2.3
AVERAGES FOR
County Station
Concentration
4
4
4
c
7 4'
•7 3.
8 4"
•8 1.
9 4"
•9 1.
5.
-
-
-
-
-
3.6
2.5
-
3.8
3.0
1.3
4.1
4.4
-
3.1
4.1
3.2
1.7
4.6
3.4
-
3.0
2.7
2.2
0.8
4.4
3.9
-
—
COMMON DAYS
Ratios
7 1 4
3 1>4
8 3 4
4 - 3.4
9 - ? 7
8 2-7
o
County
Station
3.7
9.2
3.4
2.6
1.8
3.0
4.4
5.6
8.5
3.5
2.8
-
3.1
6.3
5.7
6.6
3.6
3.1
8.3
7.1
5.2
6.2
5.9
3.8
1.9
7.5
-
2.5
—
(mg/m3)
Common
Days
23
17
16
1 -7
-------
of Charlotte, and better values for representative data can be obtained by
dividing the data from the County station by a factor between 1.4 and 3.4;
a conservative factor would be to divide by 2. This practice provides only
approximations, and a true picture of the Charlotte area can only be obtained
by the addition of more monitoring stations by the County.
It is interesting to note that during the period covered by this study,
no violations of the Federal 8-hour standard were observed at the four
temporary sites or the County site. These data seem to fit into a pattern.
The data for the maximum 8-hour carbon monoxide readings at the County site
for the months when the study took place (April and May) are plotted in
Figure 2 along with the maximum 8-hour readings for previous months since
July 1973. A decreasing trend seems obvious, and a least squares fit of
the data indicates that carbon monoxide 8-hour maximum levels at the County
station have decreased, on the average, about 30 percent over the past 3 years.
It would seem that even though the County station is situated at a "hot spot,"
the quality of the air at this location is improving. Such decreases in
maximum 8-hour averages could be caused by temporary changes in meteorological
conditions over the past 2 years, and may be only temporary. Monitoring at
this location should be continued for a number of years to confirm or dis-
prove the existence of such a trend. County air pollution officials were
unaware of any reasons for such a decreasing trend. However, the Region
may wish to investigate possible changes in traffic or industrial emissions
and changes in meteorological conditions during this period that could have
caused such an apparent trend to develop.
It should be noted that even though a decrease in carbon monoxide con-
centrations appears to have occurred, the Federal 8-hour standard is still
being violated regularly at the County site and control actions are indicated.
-------
APPENDIX
HOURLY CARBON MONOXIDE AND WIND DATA
Notes:
(1) F.S. 1 = Mecklenburg County Fire Station 1
F.S. 2 = Mecklenburg County Fire Station 2
F.S. 4 = Mecklenburg County Fire Station 4
(2) Wind speed is given in knots and direction in degrees from
true north.
(3) cal = Data missing because of instrument calibration.
-------
WEDNESDAY, 21 APRIL 76
CONCENTRATIONS (mg/m3)
TIME
(EOT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
1.8
1.6
1.4
1.0
0.6
0.5
0
F.S.
1
1.8
1.6
1.4
1.0
0.6
0.5
0
F.S. F.S. COURT COUNTY
2 4 HOUSE STATION
1.0
1.0
0.6
0,6
1.0
1.0
2.9
6.5
7.5
7.8
7.8
7.2
7.2
8.4
7.2
5.2
cal
5.5
2.9
2.0
2.0
1.6
1.3
0.6
WIND
SPEED
6
6
5
5
3
4
4
8
9
9
11
8
10
12
12
10
11
12
8
8
8
10
15
8
WIND
DIRECTION
180
180
180
180
160
140
170
220
220
220
210
200
180
210
200
180
200
170
180
180
170
230
200
180
Maximum
8-hour
average
Time period
for 8-hour
maximum
Mean winds
Time period
7.45
0700-
1500
9.9 208°
0700-1500
10
-------
THURSDAY, 22 APRIL 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
1.8
2.5
2.1
2.3
1.9
3.4
1.6
4.4
8.4
8.2
5.8
3.0
F.S. F.S. COURT COUNTY
2 4 HOUSE STATION
0.3
0.6
1.0
0.6
1.0
1.3
2.6
6.2
cal
cal
2.6
2.6
4.9
3.9
2.0
2.3
2.6
2.6
1.3
5.2
5.5
6.8
2.6
2.6
WIND
SPEED
10
8
5
5
7
7
6
8
7
7
8
3
8
5
7
4
8
6
3
3
3
5
3
calm
WIND
DIRECTION
220
190
180
180
160
220
220
260
330
020
340
140
300
330
330
020
280
260
260
230
240
270
280
calm
Maximum
8-hour
average
Time period
for 8-H max.
Mean winds
Time period
3.7
1600-
2400
4.4 260°
1600-2400
11
-------
FRIDAY, 23 APRIL 76
CONCENTRATIONS (mg/ra3)
TIME
(EOT)
Maximum
8-hour
average
Time period
for 8-H max.
Mean winds
Time period
F.S.
1
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
1.0
2.4
2.1
1.4
1.3
0.9
2.3
6.7
11.0
7.0
5.6
2.9
3.6
3.4
2.9
2.5
cal
2.2
1.4
2.6
3.8
5.2
8.3
8.9
5.5
1900-
0300
F.S.
2
F.S.
4
COURT
HOUSE
COUNTY
STATION
9.2
1100-
1900
WIND
SPEED
4.6
1100-
0300
WIND
DIRECTION
2.0
1.3
1.3
1.0
0.6
1.0
1.3
3.3
3.3
2.6
3.9
6.5
9.1
7.8
11.0
9.1
13.6
11.4
5.2
3.3
3.3
2.9
4.2
3.9
6
6
8
5
5
3
5
4
7
8
9
4
5
6
3
7
8
10
6
5
3
5
calm(O)
calm(O)
350
360
350
350
350
320
010
010
010
360
010
230
230
260
160
240
230
210
190
190
140
220
calm
calm
192°
12
-------
SATURDAY, 24 APRIL 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0550
0550-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
7.8
5.4
2.3
1.5
1.8
2.9
2.1
1.5
1.4
1.5
1.2
1.1
1.1
1.1
1.3
1.1
1.3
1.3
1.9
2.1
2.3
1.4
0.8
F.S. F.S. 'COURT COUNTY
2 4 HOUSE STATION
3.9
2.6
1.6
1.6
1.0
1.0
2.0
2.6
2.9
3.3
3.3
3.3
2.9
3.3
2.6
2.9
3.0
3.9
3.6
3.6
3.9
3.3
2.0
1.6
WIND
WIND
SPEEB DIRECTION
4
6
3
calm(O)
calm(O)
calm(O)
3
4
9
11
12
16
12
12
14
15
9
11
6
8
6
7
9
8
110
170
110
calm
calm
calm
130
220
210
250
250
200
180
190
200
230
200
230
210
200
220
170
180
170
Maximum
8-hour
average
3.2
3.4
Time period
for 8-H max. 0000-
0800
1400-
2200
Mean winds
Time period
7.3 194
0000-2200
13
-------
SUNDAY, 25 APRIL 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.5
0.4
0.4
0.3
0.2
0.2
0.3
0.3
0.7
0.7
0.5
0.7
0.6
0.5
0.5
0.5
0.7
1.0
0.7
1.0
1.1
1.1
1.0
0.9
F.S. F.S. COURT COUNTY
2 4 HOUSE STATION
1.3
1.6
1.3
1.3
1.3
1.0
0.3
1.0
1.6
1.6
2.6
3.6
2.3
2.6
2.9
2.3
2.3
2.3
2.3
2.3
2.3
1.3
1.0
0.6
WIND
SPEED
12
12
12
11
9
10
11
13
16
14
12
10
14
13
14
16
19
15
11
11
14
14
11
11
WIND
DIRECTION
190
200
180
210
200
190
190
200
200
200
220
210
240
220
220
240
240
230
230
240
240
240
240
230
Maximum
8-hour
average 0.9
2.6
Time period
for 8-H max. 1600-
2400
1000-
1800
Mean winds
Time period
13.2 23T
1000-2400
14
-------
MONDAY, 26 APRIL 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S. F.S.
1 2
0.7
0.7
0.6
0.6
0.7
0.9
2.5
5.3
2.6
2.4
2.5
2.5
2.2
1.8
1.9
2.1
1.8
0.8
0.7
0.9
0.5 0.8
1.7 0.6
1.4 0.5
0.9 0.2
F.S. COURT
4 HOUSE
3.5
1.5
2.0
2.1
1.5
1.4
0.4
0.2
COUNTY
STATION
0.6
0.6
1.0
1.3
1.0
1.3
1.3
2.0
1.6
2.0
1.6
1.6
1.6
1.6
2.0
2.0
2.3
1.0
1.3
1.6
WIND
SPEED
10
5
4
5
6
6
5
7
10
9
12
13
14
15
12
14
14
12
8
6
6
9
17
9
WIND
DIRECTION
240
300
300
330
330
320
310
310
340
360
320
330
330
300
310
340
320
340
330
330
340
030
030
040
Maximum
8-hour
average
2.7
1.8
Time period
for 8-H max. 0600-
1400
0900-
1700
Mean winds
Time period
11.4 325
0600-1200
15
-------
TUESDAY, 27 APRIL 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.7
0.5
0.6
0.5
0.8
1.7
6.5
10.2
4.6
2.7
1.9
1.9
2.1
1.8
1.6
2.5
1.0
1.4
1.2
1.6
1.6
1.4
1.0
F.S.
2
0.2
0.2
0.3
0.2
0.3
0.7
2.1
2.9
1.0
1.1
0.6
0.7
0.7
0.6
0.6
0.9
1.2
1.3
0.9
1.3
1.4
1.1
0.6
0.6
F.S. COURT
4 HOUSE
0
0.1
0
0.2
0.3
1.4
5.6
7.5
4.3
3.2
2.6
2.0
1.9
1.9
1.8
2.0
2.8
1.2
1.3
1.5
2.3
1.4
0.7
0.4
COUNTY
STATION
1.3
1.0
1.0
1.0
1.0
1.3
2.9
3.6
2.3
2.9
cal
4.2
2.3
2.3
1.3
1.6
1.6
1.0
1.0
0.6
1.0
0.6
1.0
0.6
WIND
SPEED
8
3
4
3
5
4
5
7
8
9
7
8
10
10
10
10
4
4
5
6
7
8
7
10
WIND
DIRECTION
040
090
350
060
060
040
040
020
020
310
280
260
260
300
220
270
290
060
360
360
340
040
040
050
Maximum
8-hour
average 4.0
1.2
3.6 3.0
Time period
for 8-H max.0500- 0500-
1300 1300
0600- 0600-
1400 1400
Mean winds
Time period
7.6 329
0500-1400
16
-------
WEDNESDAY, 28 APRIL 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.5
0.3
0.3
0.4
0.6
1.2
7.3
6.5
4.3
3.9
2.3
2.7
2.3
2.9
2.8
2.0
2.0
3.2
4.3
2.7
2.6
1.3
F.S.
2
0.6
0.6
0.6
0.6
0.6
0.7
1.4
1.1
1.0
1.0
1.1
0.7
0.8
1.1
0.9
1.0
0.9
0.7
0.9
1.3
1.9
1.8
1.2
0.9
F.S. COURT
4 HOUSE
0.3
0.4
2.1
3.9
2.5
2.6
2.3
2.3
1.9
2.3
1.7
2.7
1.6
1.4
1.7
2.7
2.0
1.9
1.2
COUNTY
STATION
0.6
0.6
0.6
0.3
0.6
2.0
3.9
5.9
2.9
2.6
cal
2.6
2.6
2.0
2.3
6.8
4.9
4.6
3.9
3.9
4.2
3.9
2.6
1.0
WIND
SPEED
10
6
8
6
6
8
10
8
8
8
3
7
9
4
5
7
5
6
4
5
4
4
calm(O)
8
WIND
DIRECTION
070
080
080
070
080
090
080
060
050
040
050
360
020
270
100
140
120
130
180
120
120
100
calm
360
Maximum
8-hour
average
3.6
1.2
2.5 4.4
Time period
for 8-H max.
Mean winds
Time period
0400-
1200
1500-
2300
0600- 1500-
1400 2300
5.8 77
0400-2300
17
-------
THURSDAY, 29 APRIL 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.9
0.9
0.7
0.7
0.7
1.5
6.1
11.5
6.5
3.5
2.8
2.7
2.2
2.1
1.5
1.6
1.0
0.8
2.0
3.8
4.6
4.2
2.4
F.S.
2
0.6
0.6
0.5
0.5
0.6
0.7
1.5
1.8
1.3
0.9
0.7
0.7
0.7
0.9
1.0
1.1
0.7
0.9
2.2
2.2
2.5
2.6
2.1
F.S. COURT
4 HOUSE
0.8
0.4
0.2
0.2
0.2
0.6
2.8
5.3
3.5
3.0
0.9
1.6
1.5
1.8
1.1
COUNTY
STATION
0.6
0.6
0.6
0.3
0.6
1.6
2.0
cal
6.3
6.0
6.6
8.1
5.8
4.3
4.0
4.0
4.3
4.0
3.2
2.0
WIND
SPEED
10
15
11
9
10
6
7
10
9
5
8
5
10
10
9
6
6
5
5
calm(O)
3
4
4
5
WIND
DIRECTION
040
070
060
070
070
070
070
070
070
020
100
130
200
230
230
210
240
230
140
calm
130
090
090
120
Maximum
8-hour
average
4.7
2.1
5.6
Time period
for 8-H max.
0600-
1400
1900-
0300
1200-
2000
Mean winds
Time period
5.9 136
0600-0300
18
-------
FRIDAY, 30 APRIL 76
CONCENTRATIONS (mg/in )
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.9
0.6
06
0.6
0.4
0.9
2.5
4.4
3.1
2.5
2.5
1.3
1.9
2.1
2.7
2.9
2.9
1.5
1.1
0.9
1.1
1.1
1.0
0.9
F.S.
2
1.0
1.0
1.1
0.9
0.8
0.7
1.2
1.6
1.2
1.0
0.5
0.3
0.3
0.3
0.5
0.6
0.7
0.6
0.4
0.3
0.3
0.3
0.2
0.3
F.S. COURT
4 HOUSE
0.2
0
0
0.2
1.1
2.9
3.9
3.2
3.5
3.1
3.0
3.0
4.4
6.2
2.9
0.5 1.7
0.7 1.7
0.4 1.3
0.3 1.2
0.3 1.1
0.3 0.9
COUNTY
STATION
1.2
0.9
1.2
0.9
1.4
2.3
4.6
6.0
7.8
8.3
8.8
9.2
6.3
8.6
8.1
8.9
9.5
4.6
2.9
3.5
2.3
1.7
1.7
1.7
WIND
SPEED
4
5
3
3
7
5
7
7
6
5
5
10
12
7
8
8
7
5
7
10
8
8
7
10
WIND
DIRECTION
110
160
180
190
220
160
140
180
180
180
190
190
210
180
170
190
160
180
180
200
170
170
170
160
Maximum
8-hour
average
2.6
1.1
3.8 8.5
Time period
for 8-H max.
Mean winds
Time period
0700- 0100- 0200- 0900- 0900-
1500 0900 1000 1700 1700
7.3 182
0700-1700
19
-------
SATURDAY, 1 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.9
0.8
0.8
0.9
0.9
1.0
1.2
1.2
1.6
1.8
1.7
1.7
1.6
1.2
1.5
1.4
1.3
1.2
1.9
2.6
2.3
1.5
1.6
F.S.
2
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.5
0.4
0.6
0.8
0.8
0.8
0.9
0.9
1.4
1.5
1.4
1.1
1.2
F.S.
4
0.4
0.3
0.2
0.1
0.1
0.1
0.3
0.3
0.6
1.0
1.1
1.0
1.1
0.8
0.9
1.1
0.8
0.9
0.8
1.1
1.3
1.1
0.5
0.6
COURT
HOUSE
1.4
1.2
0.9
0.9
0.7
0.8
1.
1.5
2.5
3.4
4.3
4.0
3.0
2.7
2.3
1.9
2.0
1.7
1.7
3.7
4.6
3.6
2.1
2.6
COUNTY
STATION
0.9
0.3
0.3
0.3
0.9
0.9
1.4
2.0
2.6
3.2
4.3
3.7
3.7
4.3
2.9
2.6
3.2
2.3
2.6
1.7
2.0
4.3
3.5
2.3
WIND
SPEED
4
7
6
8
10
7
8
12
12
10
10
13
18
15
16
17
12
15
9
6
4
6
3
3
WIND
DIRECTION
140
140
130
130
150
180
170
200
210
220
240
220
220
220
220
230
230
210
200
090
110
200
250
300
Maximum
8-hour
average
2.3
1.7 1.0 3.0 3.5
Time period
for 8-H max.
1900-
0300
1400-
0300
1900-
0300
or
1400-
2200
0800- 0900-
1600 1700
Mean winds
9.5
220
20
-------
SUNDAY, 2 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
2.7
3.2
2.2
1.8
1.9
2.1
2.7
2.6
2.7
2.5
1.8
1.8
1.2
1.8
1.7
1.6
1.6
1.4
1.5
1.6
1.6
1.5
1.3
1.1
F.S.
2
1.4
3.5
1.7
1.0
1.1
1.0
1.5
1.3
1.1
0.9
0.9
0.8
0.7
0.9
0.7
0.8
0.7
0.9
1.1
1.2
1.3
1.1
0.8
0.6
F.S.
4
1.0
1.3
1.1
0.5
0.5
0.9
0.6
0.9
1.2
0.8
0.8
0.8
0.7
0.7
0.6
0.8
0.9
0.9
0.9
1.0
1.0
1.0
1.0
0.3
COURT
HOUSE
1.3
2.3
1.7
1.0
1.0
0.9
1.2
1.1
1.2
0.9
0.9
1.3
0.9
0.9
0.8
0.8
0.7
0.6
1.1
1.2
1.0
0.9
0.6
0.2
COUNTY
STATION
2.0
2.3
1.7
0.9
0.9
0.9
1.4
1.2
1.2
1.2
2.3
2.3
2.3
3.2
2.6
2.3
2.6
2.6
2.6
2.9
3.2
2.0
1.7
1.2
WIND
SPEED
5
3
3
calm(O)
5
3
4
3
4
2
4
6
10
10
8
9
12
12
9
9
10
9
9
9
WIND
DIRECTION
010
340
240
calm
010
060
340
080
090
100
140
140
270
210
250
230
230
230
220
230
240
240
230
250
Maximum
8-hour
average
2.4
1.6
0.9
1.3
2.8
Time period
for 8-H max.
Mean winds
Time period
0000- 0000-
0800 0800
0100-
0900
or
1500-
2300
0000-
0800
1300-
2100
6.3
127
0000-2300
21
-------
MONDAY,3 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-9000
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.9
0.8
0.6
0.6
0.7
1.2
2.8
4.7
3.5
3.1
3.1
2.5
2.1
2.4
2.9
2,5
4.8
1.3
2.2
2.4
1.9
1.8
1.8
1.5
F.S.
2
0.6
0.4
0.3
0.3
0.3
0.9
1.8
1.8
1.0
0.7
1.3
0.7
cal
0.6
0.8
1.0
2.1
0.8
1.1
1.0
0.9
1.0
1.2
1.0
F.S.
4
0.1
0
0
0.2
0.0
0.2
1.1
3.0
1.5
0.9
0.6
0.5
0.5
0.4
0.9
0.9
0.8
0.5
0.8
0.7
0.4
0.8
0.9
0.7
COURT
HOUSE
0.2
0.1
0
0
0.1
0.6
3.5
6.2
4.4
5.6
4.5
1.0
3.9
2.0
4.0
5.3
6.7
1.7
2.2
7.2
2.7
1.5
1.3
0.7
COUNTY
STATION
1.1
1.2
0.6
0.9
1.2
2.6
6.3
cal
2.6
1.4
2.0
1.7
2.3
4.0
0.9
0.9
0.9
0.9
WIND
SPEED
5
5
4
5
5
6
9
10
8
13
7
14
12
9
8
9
8
10
8
14
8
8
4
7
WIND
DIRECTION
250
220
230
220
230
230
250
250
270
290
280
310
290
340
290
300
340
340
320
330
340
350
330
Maximum
8-hour
average
3.0
1.1
1.1
4.1
Time period
for 8-H max.
Mean winds
Time period
0700-
1500
0400-
1200
or
1500-
2300
0400-
1700
or
1200-
2000
8.9 297
0400-2300
22
-------
TUESDAY, 4 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
1.4
1.1
1.0
0.9
1.1
1.8
4.5
5.9
3.9
3.3
3.2
3.2
2.8
2.7
cal
3.5
2.6
1.4
1.0
2.6
2.7
2.4
1.7
0.9
F.S.
2
0.7
0.7
0.6
0.5
0.7
1.4
2.7
2.0
1.3
1.2
1.0
1.1
1.1
1.1
cal
1.7
1.2
0.8
0.7
1.2
1.5
1.3
0.8
0.7
F.S.
4
0.8
0.7
0.1
0.2
0.3
1.2
2.0
0.3
0.4
0.7
0.5
0.6
0.4
0.4
0.2
0.7
0.7
0.3
0.7
1.6
1.6
1.1
0.7
0.3
COURT
HOUSE
0.5
0.2
0.3
0.3
0.7
1.3
0.5
0.8
5.0
5.1
6.2
5.7
4.3
2.7
cal
3.0
3.2
1.7
1.3
1.5
1.4
1.0
1.2
0.7
COUNTY
STATION
0.9
0.6
0.6
0.6
0.6
1.2
2.6
2.9
2.0
2.6
2.3
2.0
1.7
1.7
2.0
2.3
7.8
2.9
3.5
2.3
2.3
1.7
1.2
0.6
WIND
SPEED
6
6
6
10
6
6
8
10
12
10
8
7
6
9
4
7
3
6
6
4
5
5
5
4
WIND
DIRECTION
340
340
360
350
360
010
350
020
030
050
320
350
040
070
280
270
230
190
180
180
170
150
170
170
Maximum
8-hour
average
3.7
1.5 0.9
4.4 3.1
Time period
for 8-H max.
0600- 0500- 1900-
1400 1300 0300
0800- 1300-
1500 2100
Mean winds
7.0
110
Time period
0600-2100
23
-------
WEDNESDAY, 5 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EOT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
Maximum
8-hour
average
F.S.
1
0.8
1.0
0.6
0.6
0.6
1.0
3.2
2.7
1.2
0.9
1.0
0.9
1.4
0.7
0.9
1.5
1.5
0.2
1.5
1.4
F.S.
2
0.4
0.3
0.3
0.3
0.3
0.3
0.4
0.8
0.8
0.6
0.2
0.3
0.2
0.2
0.2
0.2
0.2
0.2
0.4
0.4
0.2
0.5
F.S.
4
0.2
0.2
0.2
0.3
0.3
1.1
1.6
3.0
1.4
1.2
0.8
0.9
0.7
0.7
0.7
0.7
0.4
0.6
1.0
0.5
0.4
0.2
0.5
1.3
COURT
HOUSE
0.7
0.7
0.8
0.8
0.9
0.9
1.0
1.1
1.2
1.7
1.5
0.7
0.6
0.5
COUNTY
STATION
0.3
0.3
0.6
0.9
0.9
2.0
5.5
6.9
6.0
5.5
cal
7.2
6.3
6.3
5.5
5.8
5.2
1.7
1.7
2.3
2.3
0.9
0.6
0
6.3
WIND
SPEED
3
calm
4
3
calm
4
5
10
13
11
10
10
12
8
14
10
12
10
6
6
7
8
9
6
WIND
DIRECTION
150
calm
150
180
calm
130
180
210
220
210
200
220
210
180
190
180
200
210
180
170
170
170
170
180
Time period
for 8-H max.
Mean winds
Time period
0500-
1300
0100-
0900
0500-
1300
06CO-
1400
or
0700-
1500
9.2 196
0500-1400
24
-------
THURSDAY, 6 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S. F.S. F.S.
1 2 4
0.1
0
0.1
0.1
0.1
1.5
2.0
2.4
1.8
1.7
1.6
1.3
1.0
1.2
1.4
1.5
1.8
0.6 1.7
1.1 2.3
1.4 2.4
1.2 1.7
0.6 0.8
0.3 0.5
COURT
HOUSE
0.4
0.5
0.5
0.5
0.7
1.2
4.3
5.7
3.6
2.6
2.5
2.1
2.1
1.6
2.0
2.9
3.3
1.2
1.5
1.5
1.2
1.2
0.5
COUNTY
STATION
0
0
0
0
0
2.3
1.4
5.2
5.2
4.9
6.6
5.8
6.9
4.6
4.9
5.8
6.3
2.9
2.9
2.6
2.3
1.4
0.9
0.6
WIND
SPEED
7
7
10
7
5
4
3
8
9
11
11
11
9
9
10
13
10
8
6
6
6
5
10
8
WIND
DIRECTION
170
180
200
190
180
320
240
240
220
230
230
200
180
200
160
200
189
180
180
170
140
150
190
180
Maximum
8-hour
average
Time period
for 8-H max.
1.7
0500-
1300
3.1
0600-
1400
5.7
0900-
1200
Mean winds
Time period
9.0 217
0500-1700
25
-------
FRIDAY, 7 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S. F.S.
1 2
0.2
0.1
0.1
0.1
0.1
0.2
0.3
1.3
0.6
0.7
0.8
0.7
0.7
0.7
1.0
1.3
1.8
0.7
1.5 0.8
1.7 1.3
1.9 0.9
3.5 1.0
1.6 1.0
1.5 1.4
F.S.
4
0.1
0
0.1
0
0
0.4
1.4
2.0
1.9
1.3
1.3
1.8
1.4
1.3
1.7
1.6
1.7
1.6
1.5
2.3
1.5
1.6
1.4
1.3
COURT
HOUSE
0.4
0.6
0.6
0.3
0.5
0.4
2.9
4.4
3.7
3.2
3.2
3.1
3.7
2.9
3.2
4.3
5.8
2.6
2.7
2.0
1.8
2.1
2.5
COUNTY
STATION
0.3
0.9
0.6
0.9
0.9
2.6
3.2
8.9
7.8
7.2
cal
9.8
5.8
2.3
2.6
5.2
4.0
4.6
4.6
4.0
4.0
3.7
4.0
1.7
WIND
SPEED
9
7
8
5
8
8
10
10
9
12
11
11
13
12
8
8
7
7
4
6
6
4
3
6
WIND
DIRECTION
190
210
220
190
190
210
190
230
220
240
220
260
280
280
260
280
230
250
300
240
220
310
300
360
Maximum
8-hour
average
Time period
for 8-H max.
Mean winds
Time period
1.1 1.7
4.1
6.6
1600- 1400- 0900- 0700-
2400 2200 1700 1500
8.2 259
0700-2400
26
-------
SATURDAY, 8 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
1.2
1.1
1.2
1.4
2.1
2.3
3.2
3.8
3.9
3.9
4.7
3.5
3.0
2.6
3.4
3.0
2.1
2.1
2.7
3.5
4.0
4.1
3.0
2.5
F.S.
2
0.8
0.8
0.6
0.7
0.7
0.8
0.9
1.2
1.4
1.5
1.4
1.3
1.3
1.7
2.0
1.3
1.2
1.0
1.0
1.3
2.1
2.5
2.8
3.5
F.S.
4
0.4
0.3
0.2
0.2
0.2
0.0
0.1
0.2
0.5
0.6
0.8
0.7
0.2
0.7
0.6
0.7
0.5
0.2
0.1
0.8
1.2
2.4
2.7
2.9
COURT
HOUSE
1.9
1.0
0.4
0.4
0.4
0.8
0.9
1.2
1.9
1.6
2.9
2.3
2.2
2.0
1.7
2.0
1.8
1.4
1.5
1.4
1.8
2.6
3.4
3.8
COUNTY
STATION
1.2
1.2
0.9
0.9
0.9
0.9
1.4
1.4
1.4
2.0
2.6
2.3
2.0
2.3
2.3
2.9
2.3
2.3
2.6
3.5
3.5
4.0
3.7
3.7
WIND
SPEED
10
8
8
9
8
13
12
11
15
12
11
12
9
10
9
9
8
8
5
3
calm(O)
calm(O)
calm(O)
3
WIND
DIRECTION
040
050
050
060
060
040
060
070
060
050
060
070
050
050
050
050
040
070
060
110
calm
calm
calm
310
Maximum
8-hour
average
Time period
for 8-H max.
Mean winds
Time period
3.6
0700-
1500
3.7 2.1
3.2
3.6
2000- 2000- 2000- 2000-
0400 0400 0400 0400
6.0 61
0700-0400
27
-------
SUNDAY, 9 MAY 76
Maximum
8-hour
average
CONCENTRATIONS (mg/m3)
TIME
(EOT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
1.8
3.5
3.7
4.5
2.7
1.8
2.2
2.4
2.4
2.1
1.8
1.3
1.1
1.2
1.2
0.8
0.7
1.0
1.3
1.7
2.2
1.6
1.6
1.7
F.S.
2
4.9
3.7
5.3
4.5
3.6
3.0
2.4
1.2
1.1
1.1
1.0
0.9
0.8
0.8
0.9
0.9
0.8
0.8
0.8
1.2
1.2
1.4
1.2
1.0
F.S.
4
2.5
1.5
1.5
2.8
1.2
1.2
0.8
0.8
0.9
1.0
0.9
0.9
0.9
0.7
0.8
0.8
0.8
0.9
1.0
1.3
1.6
1.5
1.2
0.8
COURT
HOUSE
3.0
2.0
4.3
4.9
2.6
1.8
1.6
1.6
2.0
1.3
1.2
1.5
1.5
1.5
1.6
1.5
1.4
1.6
1.4
1.8
1.3
1.2
1.3
0.8
COUNTY
STATION
3.2
2.3
4.6
3.7
2.6
2.0
1.7
2.0
2.0
2.3
2.0
2.3
2.9
2.0
2.3
3.2
3.7
3.5
3.5
3.2
2.9
2.6
1.7
0.9
WIND
SPEED
calm(O)
calm(O)
calm(O)
calm(O)
calm(O)
calm(O)
calm(O)
6
6
5
3
8
5
3
5
4
5
7
6
4
4
calm(O)
calm(O)
calm(O)
WIND
DIRECTION
080
060
060
100
130
030
140
250
240
300
180
210
180
230
calm
calm
calm
2.9
1.9
1.5
1.7
Time period
for 8-H max. 0100- 2000- 0000- 2000-
0900 0400 0800 0400
or or
0400- 0400-
1200 1200
Mean winds
Time period
3.1
2000-
0400
or
1400-
2200
2.9
2000-2200
136
28
-------
MONDAY, 10 MAY 76
Maximum
8-hour
average
Time period
for 8-H max.
Mean winds
Time period
CONCENTRATIONS (mg/m3)
TIME
(EOT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
1.7
1.1
1.1
1.6
1.1
2.5
8.0
9.6
3.4
2.8
2.8
1.7
2.1
3.0
2.5
2.2
1.0
1.6
2.3
3.5
2.4
2.4
3.4
F.S.
2
0.9
1.0
0.6
0.7
0.7
0.9
2.4
2.9
1.5
0.9
0.6
0.6
0.4
0.5
0.4
0.8
0.8
0.6
0.9
1.3
1.7
1.9
1.5
1.5
F.S.
4
0.7
0.4
0.3
0.3
1.3
3.2
4.6
4.8
2.0
1.5
1.1
0.7
0.7
0.7
0.6
0.5
0.5
0.0
0.1
0.0
1.3
0.4
0.1
0.0
COURT
HOUSE
0.7
0.7
0.7
0.9
1.8
3.4
7.1
8.4
4.9
3.9
3.7
3.2
2.2
2.2
1.9
2.9
1.8
1.8
1.7
1.8
1.0
0.7
0.5
COUNTY
STATION
1.2
1.2
1.4
1.2
1.4
4.9
7.2
8.9
8.3
8.3
10.1
9.2
8.9
6.0
cal
cal
8.6
2.9
2.3
3.2
WIND
SPEED
calm(O)
4
calm(O)
calm(O)
calm(O)
calm(O)
3
3
8
6
6
5
6
8
7
8
8
8
4
calm(O)
3
3
3
calm(O)
WIND
DIRECTION
calm
140
calm
calm
calm
calm
050
220
250
240
200
180
140
190
240
230
210
220
190
calm
130
130
150
calm
3.8
0600-
1400
1.3 2.4
4.6
8.3
0100- 0400- 0500- 0700-
0900 1200 1300 1500
4.0 189
0100-1500
29
-------
TUESDAY, 11 MAY 76
Maximum
8-hour
average
Time period
for 8-H max.
Mean winds
Time period
CONCENTRATIONS (mg/m3)
TIME
(EOT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
1.3
0.3
0.1
0.0
0.1
0.4
2.7
6.1
3.6
3.1
3.5
2.2
2.7
2.1
2.3
3.5
2.3
2.0
2.1
2.5
2.4
2.4
2.0
1.4
F.S.
2
1.0
0.5
0.2
0.2
0.1
0.1
0.5
2.2
1.2
1.1
1.0
F.S.
4
2.9
1.9
1.3
1.1
1.2
1.3
2.8
4.9
1.8
1.9
2.2
2.2
1.8
1.2
1.1
1.9
1.7
0.6
1.1
0.6
0.6
0
1.0
0.5
COURT
HOUSE
0.3
0.4
0.3
0.3
0.4
0.8
3.4
3.7
3.3
2.5
3.3
3.4
2.4
2.4
2.4
4.9
1.4
1.5
1.3
1.5
1.4
0.8
0.8
COUNTY
STATION
cal
8.1
9.2
9.2
8.1
6.3
6.9
5.8
3.5
1.7
0.6
0
4.6
2.9
1.7
1.2
WIND
SPEED
4
6
6
6
3
4
5
8
3
5
6
7
10
11
11
12
8
7
5
6
5
4
4
5
WIND
DIRECTION
140
140
170
150
150
140
230
270
250
240
240
200
200
240
230
270
250
280
320
230
180
150
180
220
3.3
0600-
1400
2.1
3.4
7.1
0500- 0600- 0900-
1300 1400 1700
7.1 219
0300-1200
30
-------
WEDNESDAY, 12 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
Maximum
8-hour
average
Time period
for 8-H max.
Mean winds
Time period
F.S.
1
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
1.0
1.0
1.2
2.3
5.2
13.3
12.3
7.6
5.4
3.6
3.5
3.4
3.3
3.2
3.2
3.6
2.4
2.4
6.8
0400-
1200
F.S.
2
F.S.
0.4
0.3
0
0
1.0
2.2
3.3
3.7
2.2
1.4
1.9
1.9
2.6
3.3
COURT
HOUSE
0.7
0.4
0.4
1.7
2.4
2.8
2.5
1.2
0.6
COUNTY
STATION
5.2
1300-
2100
WIND
SPEED
WIND
DIRECTION
1.2
0.6
0.6
0.6
1.7
2.9
1.7
5.2
2.9
1.7
1.7
2.3
4.0
4.6
5.2
6.9
8.1
3.5
4.0
4.6
4.6
2.3
1.2
0.6
3
3
calm(O)
calm(O)
calm(O)
3
4
4
7
7
5
6
8
8
9
9
7
8
5
3
5
calm(O)
calm(O)
4
220
180
calm
calm
calm
270
330
270
070
320
250
310
300
290
200
240
230
220
230
130
140
calm
calm
110
5.4 249
0400-2100
31
-------
THURSDAY, 13 MAY 76
Maximum
8-hour
average
Time period
for 8-H max.
Mean winds
Time period
CONCENTRATIONS (mg/m3)
TIME
(EOT;
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S. F.S. F.S.
124
1.5
2.1
0.5
4.4
4.8
3.5
3.5
3.5
2.2
1.8
2.4
2.3
2.2
2.1
1.2
1.0 0.2 1.0
0.7 0.3 1.1
0.6 0.2 1.0
0.4 0.1 0.2
0.1 0 0.1
000
COURT
HOUSE
0.4
0.2
0.1
0.1
0.8
2.5
2.7
2.8
4.0
4.3
2.9
2.6
2.4
2.0
2.0
1.6
1.6
0.5
0.6
0.7
0.7
0.4
0.1
0.1
COUNTY
STATION
0.6
0.6
0.6
0.8
0.9
2.9
8.1
11.2
7.2
4.9
4.9
3.2
5.5
4.3
4.9
5.8
4.3
1.4
1.4
1.2
0.6
0.3
0.6
0.9
WIND
SPEED
4
3
4
calm(O)
3
4
5
9
6
5
9
8
9
7
7
14
12
13
8
8
9
10
8
8
WIND
DIRECTION
140
130
120
calm
110
080
070
090
040
090
080
120
120
100
120
140
130
120
140
160
150
160
140
150
3.3
3.0
6.2
0600- 0500- 0600-
1400 1300 1400
7.0 89
0500-1400
32
-------
FRIDAY, 14 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
1.1
1.1
0.9
0.7
0.6
1.1
3.7
6.4
4.3
3.5
3.8
3.6
3.5
2.9
3.1
3.2
3.1
1.5
0.8
0.9
0.9
0.8
0.2
0
F.S.
2
0.6
0.6
0.6
0.5
0.4
0.4
0.6
0.8
0.7
0.9
0.4
0.5
0.6
0.5
0.5
0.5
0.4
0.5
0.7
0.4
0.2
0.2
0.1
0
F.S.
4
0.1
0.2
0.2
0.2
0.1
0.5
1.5
2.6
2.2
1.7
2.0
2.4
2.3
2.0
3.3
3.1
3.0
2.2
2.0
1.5
0.7
0.6
0.5
0
COURT
HOUSE
0.1
0.0
0.1
0.2
0.2
0.3
1.7
3.0
3.6
2.5
2.9
2.7
2.6
1.8
2.2
2.2
3.0
1.0
1.0
1.1
0.8
0.7
0.4
COUNTY
STATION
0.3
0.3
0.3
0.3
0.3
1.4
2.9
5.8
4.9
5.2
6.0
5.8
7.8
6.0
cal
5.5
4.3
1.7
1.7
1.7
1.4
0.9
0,6
0
WIND
SPEED
7
6
8
7
7
4
9
10
11
13
10
12
9
12
11
12
13
14
10
18
8
12
12
12
WIND
DIRECTION
130
140
140
150
170
140
160
150
170
170
180
200
170
200
180
120
190
130
130
140
140
150
140
150
Maximum
8-hour
average 4.0
Time period
for 8-H max. 0600-
1400
Mean winds
Time period
0.6 2.4
2.7
5.9
0600- 1000- 0900- 0700-
1400 1800 1700 1800
11.5 176
0700-1700
33
-------
SATURDAY, 15 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.2
0.2
0
0.1
0
0.3
0.5
0.8
1.1
1.4
1.4
1.4
2.0
1.4
1.0
2.0
3.1
3.0
4.1
3.6
3.2
2.3
2.4
1.6
F.S.
2
0.1
0
0.1
0
0.1
0.1
0.1
0.2
0.3
0.1
0.2
0.2
0.3
0.3
0.3
0.5
1.4
1.7
1.3
1.7
1.6
1.0
1.0
0.7
F.S.
4
0.2
0.2
0
0.1
0
0.1
1.3
0.6
0.9
0.9
1.1
1.3
1.6
1.3
0.9
1.7
2.4
1.9
1.6
1.7
1.5
1.0
0.2
0.9
COURT
HOUSE
0.2
0.2
0.1
0.1
0.1
0.2
0.5
0.5
0.8
1.0
0.9
1.2
1.4
1.1
1.4
2.7
2.8
2.1
2.0
2.2
2.1
1.8
2.0
2.2
COUNTY
STATION
0
0
0
0
0
0.3
0.6
0.9
1.2
1.2
1.2
1.7
2.3
1.7
2.6
4.6
4.9
4.6
4.6
4.0
2.6
2.3
2.6
0.6
WIND
SPEED
10
11
12
11
9
12
14
13
14
14
15
15
7
15
7
5
4
6
5
4
7
5
3
7
WIND
DIRECTION
140
140
140
150
160
150
140
140
150
160
160
160
120
180
200
110
100
100
100
090
090
090
070
050
1.3 1.6
2.2
3.8
1600- 1200- 1500- 1500-
2400 2000 2300 2300
4.9 94
1500-2300
34
-------
SUNDAY, 16 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
1.0
0.6
0.3
0
0
0.3
0.5
0.4
0.4
0.5
1.0
1.1
1.1
1.3
1.2
1.1
1.2
1.4
1.5
1.2
0.9
0.9
0.7
0.0
F.S.
2
0.5
0.3
0.1
0
0
0.2
0.2
0.3
0.2
0.3
0.3
0.4
0.6
0.8
0.8
0.8
0.9
0.9
1.1
1.0
0.5
0.4
0.3
0.2
F.S.
4
0.6
0.3
0.2
0.1
0
0.3
0.5
0.3
0.8
0.9
0.8
1.3
1.1
1.2
1.1
1.3
1.4
1.5
1.2
0.8
0.9
1.3
0.2
0.2
COURT
HOUSE
1.2
0.7
0.5
0.4
0.1
0.1
0.4
0.6
0.9
0.8
0.8
0.9
0.9
0.5
0.7
0.7
0.7
0.9
1.0
0.7
0.6
0.4
0.4
0.2
COUNTY
STATION
0.3
0.6
0.3
0
0
0
0.6
0.9
1.4
1.4
1.7
2.0
1.0
1.4
2.3
2.6
2.3
1.4
1.7
1.2
0.6
0.3
0
0
WIND
SPEED
7
8
5
12
4
4
7
11
10
11
12
11
10
14
13
10
10
10
8
7
10
11
11
8
WIND
DIRECTION
090
120
130
130
170
140
190
200
230
220
240
230
230
230
220
220
230
200
210
170
170
180
180
210
Maximum
8-hour
average
Time period
1.3
Time period
for 8-H max. 1200-
2000
0.8 1.3 0.8
1200- 1100- 1100-
2000 1900 1900
1.9
0900-
1700
or
1100-
1900
0900-1900
35
-------
MONDAY, 17 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.1
0.1
0.1
0.1
0.6
3.5
5.7
2.8
2.1
2.7
2.3
2.6
1.9
2.2
2.6
2.9
1.6
1.5
1.6
1.8
1.6
1.6
1.1
F.S.
2
0.2
0.1
0.2
0.5
1.3
0.8
0.6
0.7
1.0
0.9
1.0
1.3
1.3
1.3
1.0
1.0
1.1
1.0
1.2
0.9
1.0
F.S.
4
0
0.1
0.2
0.1
0.6
1.2
2.5
3.1
2.2
2.2
2.4
2.3
2.4
2.3
2.2
2.1
2.7
2.1
2.3
2.3
2.5
2.2
2.1
2.2
COURT
HOUSE
0.4
0.2
0.2
0.2
1.2
1.6
4.9
6.9
4.5
4.8
3.7
3.5
4.3
2.4
3.4
3.3
3.4
4.2
1.3
1.2
1.5
1.1
1.0
0.8
COUNTY
STATION
0.3
0.6
0.9
0.3
0.9
2.6
8.3
7.2
7.5
cal
7.2
7.5
7.2
6.3
7.5
8.9
7.8
2.0
WIND
SPEED
4
4
4
8
8
4
7
8
10
7
9
12
13
15
14
14
14
14
11
6
8
8
6
7
WIND
DIRECTION
220
240
180
220
250
180
200
240
230
250
220
230
240
240
240
220
230
220
230
230
220
230
230
220
Maximum
8-hour
average
3.0
1.2
2.4
4.4
7.5
Time period
for 8-H max.0600- 1400- 0600- 0500- 0900-
1400 2200 1400 1400 1700
Mean winds
10.1 231
Time period
0600-1400
36
-------
TUESDAY, 18 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.1
0.7
3.0
7.3
3.9
2.3
2.0
1.8
2.2
1.5
3.3
3.2
1.3
0.7
0.9
0.9
0.9
1.0
0.9
0.6
F.S.
2
0.1
0.1
0.1
0.1
0.3
1.6
1.4
1.0
0.9
0.8
0.8
0.8
0.7
1.0
1.1
0.6
0.6
0.7
0.9
1.0
0.9
0.8
F.S.
4
0.5
0.2
0.3
0.1
0.7
2.9
4.2
3.4
2.1
1.8
1.7
2.1
1.0
0.3
0.3
0.3
COURT
HOUSE
0.4
0.4
0.4
0.4
0.3
1.0
5.2
7.0
4.4
3.6
3.7
2.5
2.0
3.0
3.4
5.4
4.9
1.1
0.8
1.5
1.1
0.7
0.4
0.1
COUNTY
STATION
cal
7.2
5.2
1.4
1.2
1.4
1.4
0.3
0.6
0.3
WIND
SPEED
7
4
calm(O)
3
4
5
4
6
9
9
12
13
15
12
7
13
15
16
13
6
4
4
6
4
WIND
DIRECTION
240
220
calm
270
230
190
260
210
210
240
240
220
230
330
310
320
340
340
320
320
330
310
340
010
Maximum
8-hour
average 3.0
1.0
2.4
3.9
Time Period
for 8-H max.0700- 0600- 0600- 0600-
1500 1400 1400 1400
Mean winds
10.0
257
Time period
0600-1500
37
-------
WEDNESDAY, 19 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EOT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.1
0.2
0.1
0.9
1.1
4.3
6.5
2.4
1.7
2.3
1.7
1.8
1.8
1.6
2.1
1.9
1.0
0.2
0.3
0.4
0.8
0.7
0.4
F.S.
2
0.7
0.8
0.9
0.6
0.7
1.5
2.9
2.8
1.3
1.1
1.2
1.1
1.0
1.3
1.3
1.5
1.5
0.7
1.0
0.7
1.4
1.4
0.9
1.0
F.S.
4
0.2
0.1
0.1
0.5
1.0
2.9
2.4
2.0
1.8
2.0
1.5
1.7
2.1
1.8
1.5
2.1
0.8
1.3
1.7
1.7
1.5
1.3
1.2
COURT
HOUSE
0.1
0.1
0.1
0.1
0.1
0.8
4.1
4.6
COUNTY
STATION
0.3
0.3
0.3
0.3
2.6
4.0
3.7
2.0
3.2
2.0
1.2
1.4
2.6
1.7
2.9
2.9
2.0
1.4
1.4
2.0
1.2
0.3
0.6
WIND
SPEED
5
4
6
4
6
4
6
8
11
12
11
15
14
15
15
13
11
15
14
5
6
4
6
3
WIND
DIRECTION
290
270
270
260
260
270
270
280
260
240
280
280
270
270
270
270
280
250
260
280
290
220
300
240
Maximum
8-hour
average 2.8
1.6
2.0
2.5
Time Period
for 8-H max.0600- 0500- 0600-
1400 1300 1400
0500-
1300
Mean winds
11.1
269
Time period
0500-1400
38
-------
THURSDAY, 20 MAY 76
CONCENTRATIONS (mg/m3)
TIME
(EDT)
0000-0100
0100-0200
0200-0300
0300-0400
0400-0500
0500-0600
0600-0700
0700-0800
0800-0900
0900-1000
1000-1100
1100-1200
1200-1300
1300-1400
1400-1500
1500-1600
1600-1700
1700-1800
1800-1900
1900-2000
2000-2100
2100-2200
2200-2300
2300-2400
F.S.
1
0.1
0.2
0.3
0.6
3.4
10.5
12.8
2.8
1.5
1.3
1.0
0.8
0.5
0.7
0.9
F.S.
2
0.8
0.6
0.5
0.5
0.8
2.8
5.5
5.5
1.5
0.5
0.3
0.2
0.3
0.2
0.4
0.3
0.4
F.S.
4
0.5
0.2
0.6
0.9
1.5
4.4
3.4
1.7
2.0
1.9
2.1
1.7
1.6
1.8
1.8
2.0
1.3
1.9
COURT COUNTY
HOUSE STATION
0.6
0.6
0.6
0.6
2.3
3.2
4.3
4.9
2.0
3.2
6.0
6.6
WIND
SPEED
4
calm(O)
4
5
5
4
calm(O)
5
5
4
10
13
15
14
11
8
8
11
7
9
7
5
5
4
WIND
DIRECTION
020
calm
300
270
090
240
calm
320
290
240
220
230
200
230
230
250
240
230
230
220
220
230
200
240
Maximum
8-hour
average 3.7
2.2
2.3
Time Period
for 8-H max.0500- 0100- 0600-
1300 0900 1400
Mean winds
6.7
268
Time period
0100-1400
39
-------
TECHNICAL REPORT DATA
(Please read Instructions on the reverse before completing)
1. REPORT NO.
EPA-600/4-77-013
3. RECIPIENT'S ACCESSIOI*NO.
4. TITLE AND SUBTITLE
CARBON MONOXIDE LEVELS IN CHARLOTTE, NORTH CAROLINA
5. REPORT DATE
February 1977
6. PERFORMING ORGANIZATION CODE
7. AUTHOR(S)
Norman E. Hester and John Prince
8. PERFORMING ORGANIZATION REPORT NO.
9. PERFORMING ORGANIZATION NAME AND ADDRESS
Environmental Monitoring and Support Laboratory
Office of Research and Development
U.S. Environmental Protection Agency
Las Vegas, Nevada 89114
10. PROGRAM ELEMENT NO.
1AD606
11. CONTRACT/GRANT NO.
12. SPONSORING AGENCY NAME AND ADDRESS
U.S. Enviornmental Protection Agency-Las Vegas, NV
Office of Research and Development
Environmental Monitoring and Support Laboratory
Las Vegas, Nevada 89114
13. TYPE OF REPORT AND PERIOD COVERED
Tech. Support Apr.-May 1976
14. SPONSORING AGENCY CODE
EPA/600/07
15. SUPPLEMENTARY NOTES
John Prince is an employee of Lockheed Electronics Co., 4220 South Maryland
Parkway. Suite 120, Las Vegas, Nevada 89109
16. ABSTRACT
Four temporary monitoring stations were set up in Charlotte, North Carolina
during the months of April and May 1976. Results from the temporary stations
were compared with data from the local monitoring station to determine if the
local station was producing data representative of the city or of a localized
hot spot.
The maximum 8-hour averages of carbon monoxide data collected at this county
station were found to be higher than those collected at the four temporary
sites by factors of 1.4, 1.6, 2.7, and 3.3. Based on these results, it was
concluded that the local station was not representative of the metropolitan
area.
17.
KEY WORDS AND DOCUMENT ANALYSIS
DESCRIPTORS
b.IDENTIFIERS/OPEN ENDED TERMS
COSATl Field/Group
Air pollution
Carbon Monoxide
Measurements
Charlotte, North Carolina
Mecklenburg County
EPA Region VIII
Air quality
Monitoring
13B
07B, C
14B
13. DISTRIBUTION STATEMENT
RELEASE TO PUBLIC
19. SECURITY CLASS (This Report)
Unclassified
21. NO. OF PAGES
44
20. SECURITY CLASS (This page)
Unclassified
22. PRICE
EPA Form 2220-1 (9-73)
------- |