EPAProposed Rule
Air Quality State Implementation Plans; Approvals and Promulgations: Arizona; Phoenix-Mesa Nonattainment Area; Determination of Attainment by the Attainment Date But For International Emissions for the 2015 Ozone National Ambient Air Quality Standards
EnvironmentTransportation
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Summary
The EPA is proposing to recognize that the Phoenix-Mesa area would meet federal air quality standards for ozone pollution by the required deadline if not for pollution drifting in from other countries. This determination could affect what pollution-control measures Arizona must implement in the region.
Key Points
- 1The EPA is evaluating whether Phoenix-Mesa's ozone pollution problem is largely caused by emissions from outside the United States rather than local sources
- 2If approved, this ruling would acknowledge that Arizona has done enough locally to meet federal air quality standards, despite current pollution levels
- 3The determination applies specifically to the 2015 federal ozone standards in the Phoenix-Mesa area
- 4Public comment period runs from November 19, 2025 to December 20, 2025 for people to share their views on this proposal
- 5The outcome could reduce the number of additional air quality regulations Arizona must impose on local industries and vehicles
Key Dates
Published
November 19, 2025
This summary is for informational purposes only. It may not capture all nuances of the regulation. Always refer to the official text for authoritative information.
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