Weather Makes a Difference: 8-hour
Ozone Trends for 1997-2007

State and Local Information for EPA Region 2
New York

Composite trend for available sites in New York:

EPA Region 02 (selected sites)

80

70

60

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New York
Ozone

On average, ozone adjusted for weather conditions declined 11 percent between 1997 and
2007. These improvements in ozone are in response to both state and regional reductions
in NOx and VOC emissions. The level of ozone improvement varies from site to site.

Trends for 1997-2007 for rural sites and urban areas with complete ozone and
meteorology data are presented below. Ozone season (May 1 - September 30) averages
of daily maximum 8-hour ozone were adjusted to remove the influence of year-to-year
variability in weather conditions. The dotted line shows the trend in observed values at
monitoring sites, while the solid line illustrates the underlying ozone trend after removing
the effects of weather. The solid line serves as a m ore accurate ozone trend for assessing
changes in emissions. Typical weather conditions are determined by averaging
conditions (e.g., temperature, humidity, etc.) for the time period presented. The
information provided is useful for reviewing the weather influence for a particular ozone
season. The solid line represents ozone levels anticipated under typical weather
conditions.

Seasonal Average 8-hour Ozone Trends

Albany, NY 8-hr Ozone Trends

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20

	Adjusted for Weather

	Unadjusted for Weather

1998 2000

2002
Year

2004 2006


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New York, NY 8-hr Ozone Trends

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Buffalo, NY 8-hr Ozone Trends

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N

0

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CD

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CD
C

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		 Adjusted for Weather

	 Unadjusted for Weather

1998

2000

2002
Year

2004

2006

Syracuse, NY 8-hr Ozone Trends

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CL
Gl

0 80
c
o

N

O

o) 60

O)

CD

i

CD

5 40

CD
C
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if)

CD
CD
CO

- .

-8-

g.8

20

		 Adjusted for Weather

	 Unadjusted for Weather



1998 2000 2002



2004 2006

Year


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Rochester, NY 8-hr Ozone Trends

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Q.

Q.

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cc

L.

CD

5 40

cc
c
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cs

0)

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* M *

20

	 Adjusted for Weather

	 Unadjusted for Weather

1998

2000

2002
Year

2004

2006


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