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Phoenix | Ozone Nonattainment Area
County Affected:
Parts of Maricopa, Gila and Pinal County | View on a Map >
Nonattainment Area Designation Date:
2008 National Ambient Air Quality Standard
May 4, 2016
2015 National Ambient Air Quality Standard
June 4, 2018
Classification Level:
Moderate, classification under the 2008 ozone standard. Marginal classification under the 2015 ozone standard.
Pollutant of Concern:
- Ozone (2008 standard; 75 ppb)
- Ozone (2015 standard; 70 ppb)
Summary:
2008 Standard
The concentration of ozone in the air in Phoenix is above the 2008 and 2015 ozone standard. Maricopa Association of Governments (MAG) submitted a plan to EPA in January 2017 for the 2008 ozone standard.
Key controls in the plan include:
- Summer fuel reformulation
- Emissions testing
- Federal Tier 2 and Tier 3 vehicle fuel standards
- Coordinated traffic signal systems
2015 Standard
MAG submitted a plan to EPA on July 8, 2020 for the 2015 ozone standard.
Marginal State Implementation Plan Elements:
• Emission Statement (EPA Proposed Approval on Dec. 14, 2021) | View Register >
• Emission Inventory (EPA Proposed Approval on Oct. 22, 2021) | View Register >
• New Source Review (EPA Proposed Approval on Feb. 23, 2021) | View Register >
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