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Regulations.govProposedMaintainsFederal contextVerified

EPA Approves Missouri's Plan to Reduce Ground-Level Ozone Pollution in the St. Louis Area

Official: Air Quality State Implementation Plans; Approvals and Promulgations: Missouri; Moderate Attainment Plan Elements for the 2015 8-Hour Ozone Standard for the Missouri Portion of the St. Louis Nonattainment Area

Reading: The EPA is approving Missouri's plan to comply with the existing 2015 ozone standard, continuing an established federal air-quality requirement rather than strengthening or relaxing it.

What this means for you

Louis region.

In clear language

The EPA is approving Missouri's plan to reduce ground-level ozone pollution in the St. Louis area to meet federal air quality standards set in 2015. This plan includes specific steps Missouri will take to bring the region into compliance with clean-air requirements. The approval allows Missouri to move forward with implementing pollution-reduction measures in the St. Louis region.

How does this affect you?

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Who does this affect?

  • Residents of the St. Louis area (including those in Missouri portions) who breathe air affected by ozone pollution
  • Businesses and industrial facilities in the St. Louis region that must comply with emission limits
  • Missouri state environmental agencies responsible for enforcing air quality rules

What can you do?

  1. Monitor local air quality reports, especially on high-ozone days, and limit outdoor activity when air quality is poor
  2. Support local efforts to reduce vehicle emissions by using public transit, carpooling, or electric vehicles when possible

Timeline

  • Comment period closed: 2026-09-15
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