News and Events Involving Environmental Law, Published by Chicago Environmental Attorney Dave Scriven-Young
of Peckar & Abramson, P.C. -- (312) 881-6309

USEPA Determines That St. Louis Metro Area Has Attained 1997 8-Hour National Ambient Air Quality Standard for Ozone

On June 9, 2011, U.S. EPA published a notice in the Federal Register making a determination that the St. Louis (MO–IL) metropolitan nonattainment area has attained the 1997 8-hour National Ambient Air Quality Standard (NAAQS) for ozone. The Clean Air Act requires EPA to set NAAQS for wide-spread pollutants from numerous and diverse sources considered harmful to public health and the environment. The St. Louis metropolitan ozone nonattainment area includes the counties of Franklin, Jefferson, St. Charles, and St. Louis as well as St. Louis City in Missouri; and the counties of Madison, Monroe, St. Clair, and Jersey in Illinois.

EPA’s final determination is based on three years of complete, quality assured ambient air quality monitoring data for Missouri and Illinois for the 2008 through 2010 ozone seasons showing attainment of the NAAQS at all ozone monitoring sites in the nonattainment area. Based on this final determination, the obligation to submit certain ozone attainment demonstration requirements, along with other requirements related to the attainment of the 1997 8-hour ozone standard are suspended.

For example, “as provided in 40 CFR 51.918, based on this determination, certain attainment demonstration requirements and associated reasonably available control measures, reasonable further progress plans, contingency measures, and other planning [State Implementation Plan] requirements related to attainment of the 8-hour ozone NAAQS shall be suspended as to the St. Louis nonattainment area. Under 40 CFR 51.918, a final determination that the area has met the 1997 8-hour ozone standard suspends the state’s obligation to submit requirements related to attainment, for so long as the area continues to attain the standard.”

Stay tuned to the Illinois Environmental Law Blog for more news and developments. To set up a free initial consultation to discuss your legal matter, please contact Dave Scriven-Young at (312) 239-9722 or

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