8-Hour Ozone (2015) Notes

Check the Air Quality Design Value site for design value updates.

1. The level of the 2015 NAAQS for 8-Hour Ozone is 0.070 ppm.

2. Fifty one 8-Hour Ozone (2015) NAAQS areas were designated on August 3, 2018. The area designations were based on 2014-2016 design values except for the Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, for which EPA has not finalized design values. On September 24, 2018, one additional area (San Antonio TX) was designated nonattainment based on 2015-2017 design values.

3. Areas designated nonattainment for 2015 Ozone NAAQS that were previously nonattainment for the 2008 Ozone NAAQS and where the nonattainment boundaries for the 2015 NAAQS are smaller than the boundaries for the 2008 Ozone NAAQS are:
   
   

   2015 Ozone NAAQS Nonattainment Area Name	Counties in 2008 Ozone NAAQS Area but not in 2015 Ozone NAAQS Area
   Atlanta, GA	Paulding GA, Douglas GA, Coweta GA, Fayette GA, Rockadale GA, Newton GA, Forsyth GA, Cherokee GA
   Chicago, IL-IN-WI	Part of Kenosha WI, McHenry IL, Part of Lake IN, Porter IN
   Cincinnati, OH-KY	Part of Dearborn IN, Clinton OH
   Cleveland, OH	Ashtabula OH
   Columbus, OH	Knox OH, Madison OH
   Dallas-Fort Worth, TX	Rockwall TX
   Houston-Galveston-Brazoria, TX	Liberty TX and Waller TX
   Sheboygan, WI	Part of Sheboygan WI
   St. Louis, MO-IL	part of Franklin MO, Jefferson MO, Monroe IL