My Community

image of paper cutouts of people to symbolize a community

Phoenix | Ozone Nonattainment Area

Revised on: February 1, 2022 - 8:48am

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 >

Unfamiliar with some of the acronyms or technical terms used on this page?

Visit our glossary | View Glossary >