"This map shows the boundaries of the designated Chico (Butte County), CA 2008 8-hour ozone nonattainment area. It includes the boundaries of associated 1997 8-hour ozone nonattainment and/or maintenance areas, as well as any associated MPOs. The map is intended to depict the extent of 2008 8-hour ozone nonattainment in this area, and how the boundaries of the 2008 8-hour area, 1997 8-hour area, and the MPO planning area relate to each other."
Chico (Butte County), CA 2008 8-hour Ozone Nonattainment Area
Chico, CA 1997 8-hour Ozone Nonattainment Area
Butte County Association of Governments