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Regulation & law · 13/08/2026

EPA Approves Illinois Portion of St. Louis Area for 2015 Ozone Standard

The Environmental Protection Agency (EPA) has determined that the Illinois portion of the St. Louis area has achieved clean data for the 2015 ozone standard, based on quality-assured air monitoring data for the 2023-2025 period.

Original source language: Federal Register — All DocumentsOpen original release →

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