California County Beats Ozone Deadline Thanks to Weird Weather Waivers
Published Date: 6/3/2025
Proposed Rule
Summary
The EPA says Mariposa County in California met the 2015 ozone air quality standards by the August 3, 2024 deadline, thanks to some unusual events that caused extra pollution days being set aside. This means the area is on track with clean air goals, helping local communities breathe easier without new costly rules. If finalized, this decision wraps up EPA’s review for Mariposa’s air quality progress.
Analyzed Economic Effects
3 provisions identified: 3 benefits, 0 costs, 0 mixed.
Mariposa found to have met ozone standard
The EPA proposes that the Mariposa County nonattainment area in California, classified as "Moderate" for the 2015 8-hour ozone standard, attained the 2015 ozone NAAQS by the August 3, 2024 attainment date.
Exceedances excluded as exceptional events
The EPA’s proposed determination is based on excluding 2015 ozone standard exceedances that occurred on multiple days in 2021 and 2022 because those exceedances are due to exceptional events.
No new costly rules for local area (if finalized)
The EPA notes the proposed attainment determination means the Mariposa area is on track with clean-air goals and, as stated in the summary, helps local communities breathe easier without new costly rules if finalized.
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Key Dates
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