Weather Makes a Difference: 8-hour Ozone Trends for 1997-2006 State and Local Information for EPA Region 5 Illinois Indiana Michigan Minnesota Ohio Wisconsin Composite trend for available sites in these states: EPA Region 05 (selected sites) ^ 80 CL > c n 60 O ® cn CO 50 2 CD > 40 < ro c o c/) CD 20 if) o... - 9 -O. o. 30- Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 U.S. Environmental Protection Agency Office of Air and Radiation Office of Air Quality Planning and Standards April 2007 ------- Illinois Ozone In Chicago ozone declined 10 percent between 1997 and 2006. 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 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 Chicago, IL .Q CL Q. CD 80 c o N O £,60 CO CO CD - 40 CO c o c/) CO .9 20 - . o. c/) Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Indiana Ozone On average, ozone declined 12 percent between 1997 and 2006. 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 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 Vincennes, IN .Q CL CL Adjusted for Weather Unadjusted for Weather cd 80 - c o N O 8,60- o CD > CO o ' * CO c o c/) 1998 2000 2002 2004 2006 Year ------- Fort Wayne, IN .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 |C/) o. -8' Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 Indianapolis, IN .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 an 0% .0, -•8- , °. Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Salamonie Reservoir, IN .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 |C/) Adjusted for Weather Unadjusted for Weather -2-. 1998 2000 2002 Year 2004 2006 ------- Michigan Ozone On average, ozone declined 10 percent between 1997 and 2006. 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 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 Unionville, Ml .Q CL Q. CD 80 c o N O £,60 CO CO CD - 40 CO c o c/) CO .9 20 Adjusted for Weather Unadjusted for Weather if) 1998 2000 2002 Year 2004 2006 ------- Ann Arbor, Ml .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 |C/) Adjusted for Weather Unadjusted for Weather O - • 1998 2000 2002 Year 2004 2006 Detroit, Ml .Q CL Q. CD 80 c o N O £,60 CO CO l_ CD - 40 CO c o c/) CO CD 20 IO) O. Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Grand Rapids, Ml .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 |C/) . 0 . _ —• — Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Minnesota Ozone On average, ozone declined 4 percent between 1997 and 2006. 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 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 Voyageurs NP, MN .Q CL CL Adjusted for Weather Unadjusted for Weather cd 80 - c o N O CD > < 40 - ^8^, CO c o c/) 1998 2000 2002 2004 2006 Year ------- Minneapolis, MN .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 an -it Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Ohio Ozone On average, ozone declined 9 percent between 1997 and 2006. 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 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 Youngstown, OH .Q CL Q. CD 80 c o N O £,60 CO CO CD - 40 CO c o c/) CO .9 20 c/) -5-" .-o.. Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Akron, OH .Q CL CL CD 80 " c o N O £,60 - CO CO CD - 40- co c o ». _. o. .o. CO CO CD 20 - 75 Adjusted for Weather — Unadjusted for Weather i i i i i 1998 2000 2002 2004 2006 Year Cincinnati, OH .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 an ~5" o. 0 Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Cleveland, OH .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 an —• — Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 Columbus,OH .Q CL Q. CD 80 c o N O £,60 CO CO CD - 40 CO c o CO CO CD 20 |C/) Tr:8' .o Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Dayton, OH .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 an -rr:#' --8' Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 Deer Creek, OH .Q CL Q. CD 80 c o N O £,60 CO CO CD - 40 CO c o c/) CO CD 20 an Adjusted for Weather Unadjusted for Weather «\ ( • o--. -8= 1998 2000 2002 Year 2004 2006 ------- Lykens, OH .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 an Adjusted for Weather Unadjusted for Weather Jy* , 1998 2000 2002 Year 2004 2006 Oxford, OH .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 |C/) Adjusted for Weather Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Toledo, OH .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 an .8^" ° . Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Wisconsin Ozone On average, ozone declined 11 percent between 1997 and 2006. 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 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 Milwaukee, Wl .Q CL Q. CD 80 c o N O £,60 CO CO CD - 40 CO c o c/) CO .9 20 c/) .»u: .o... o. Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- Madison, Wl .Q CL Q. CD 80 c o N O £,60 O) CO CD - 40 CO c o CO CO CD 20 an o. Adjusted for Weather — Unadjusted for Weather 1998 2000 2002 Year 2004 2006 ------- |