Weather Makes a Difference: 8-hour
Ozone Trends for 1997-2007
State and Local Information for EPA Region 4
Alabama
Florida
Georgia
Kentucky
Mississippi
North Carolina
South Carolina
Tennessee
Composite trend for available sites in these states:
EPA Region 04 (selected sites)
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Alabama
Ozone
On average, ozone adjusted for weather conditions declined 9 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 1997-2006 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
Sand Mountain, AL
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Birmingham, AL 8-hr Ozone Trends
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1998
2000
2002
Year
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2006
Montgomery, AL
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1998
2000
2002
Year
2004
2006
-------
Florida
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 more 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
Tampa, FL 8-hr Ozone Trends
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1998 2000 2002 2004 2006
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Jacksonville, FL 8-hr Ozone Trends
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1998
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Miami, FL 8-hr Ozone Trends
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1998
2000
2002
Year
2004
2006
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Orlando, FL 8-hr Ozone Trends
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Georgia
Ozone
On average, ozone adjusted for weather conditions declined 9 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 1997-2006 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
Savannah, GA 8-hr Ozone Trends
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1998
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Atlanta, GA 8-hr Ozone Trends
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Kentucky
Ozone
On average, ozone adjusted for weather conditions declined 12 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
Mackvilie2, KY
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Cadiz, KY
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Lexington, KY 8-hr Ozone Trends
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1998
2000
2002
Year
2004
2006
Louisville, KY 8-hr Ozone Trends
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Mackville, KY
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Mississippi
Ozone
In Jackson, MS, ozone adjusted for weather conditions declined 24 percent between 1997
and 2007. This improvement in ozone is in response to both state and regional reductions
in NOx and VOC emissions.
Trends for 1997-2007 for a site 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 more 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
Jackson, MS 8-hr Ozone Trends
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1998
2000
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Year
2004
2006
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North Carolina
Ozone
On average, ozone adjusted for weather conditions declined 16 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
Raleigh, NC 8-hr Ozone Trends
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Beaufort, NC
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Candor, NC
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2000
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Coweeta, NC
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1998
2000
2002
Year
2004
2006
-------
Greensboro, NC 8-hr Ozone Trends
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South Carolina
Ozone
On average, ozone adjusted for weather conditions declined 4 percent between 1997 and
2007. There have been improvements in Columbia and Greenville in recent years. These
improvements in ozone are in response to both state and regional reductions in NOx and
VOC emissions. Ozone trends vary 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 more 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
Greenville, SC 8-hr Ozone Trends
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Charleston, SC 8-hr Ozone I rends
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1998
2000
2002
Year
2004
2006
Columbia, SC 8-hr Ozone Trends
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Ozone
On average, ozone adjusted for weather conditions declined 14 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 more 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
Speedwell, TN
n
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1998
2000
2002
Year
2004
2006
-------
Chattanooga, TN 8-hr Ozone Trends
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1998
2000
2002
Year
2004
2006
Edgar Evins, TN
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05
1998
2000
2002
Year
2004
2006
-------
Knoxville, TN 8-hr Ozone Trends
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Unadjusted for Weather
1998
2000
2002
Year
2004
2006
Memphis, TN 8-hr Ozone Trends
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Adjusted for Weather
Unadjusted for Weather
1998
2000
2002
Year
2004
2006
-------
Nashville, IN 8-hr Ozone Trends
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