Revised On: May. 5th, 2025 - 09:47 am
Nonattainment areas are classified by the Environmental Protection Agency (EPA) to have air quality monitoring data for criteria pollutants above the National Ambient Air Quality Standards (NAAQS), which are outlined in the Clean Air Act. These areas are designated conservatively and are not necessarily exceeding the NAAQS every day. The Clean Air Act requires that ADEQ include an updated emissions inventory, a modeled attainment demonstration, a strategy for possible exceptional events demonstrations, and rules for pollution controls. ADEQ will be working with permitted facilities, local government, and community stakeholders in a collaborative effort to develop the SIP’s for these nonattainment areas.
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Cochise County
Gila County
Maricopa County
Pinal County
Pima County
Santa Cruz County
Yuma County
Counties with no nonattainment areas at this time:
- Apache County
- Coconino County
- Graham County
- Greenlee County
- La Paz County
- Mohave County
- Navajo County
- Yavapai County
National Ambient Air Quality Standards
EPA Nonattainment Areas for Criteria Pollutants | Learn More >
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