EPA Admits Oops On Ozone Cross-Section Implementation Date Mixup
Published Date: 1/16/2025
Rule
Summary
The EPA fixed a mistake in a recent ozone measurement rule to clear up who needs to follow new dates for using updated ozone data. State, local, and Tribal air monitoring groups now have clear deadlines in 2025 and 2026 to switch to the new method. This correction doesn’t change the rule itself, just makes the timing and who it affects easier to understand—no extra costs or delays expected.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
Ozone monitors: SRPs start Jan 1, 2025
The rule clarifies that all U.S. Standard Reference Photometers (SRPs) must begin using the updated ozone absorption cross-section value on January 1, 2025. State, local, and Tribal monitoring agencies are expected to complete implementation across other ozone transfer standards and field monitors by December 31, 2026. The correction does not change the rule itself, only which entities and dates apply.
No added costs; small entities not impacted
The EPA states this correction does not make substantive changes and expects minimal costs. The agency certifies the action will not have a significant economic impact on a substantial number of small entities and contains no unfunded mandates.
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Key Dates
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