Regulation & law · 02/10/2015Updated: 10/17/2026 · 1 min read

EPA Approves Missouri's Plan to Maintain Air Quality Standards for St. Louis Area

The Environmental Protection Agency (EPA) has approved Missouri's plan to maintain air quality standards for the St. Louis area for the next 10 years, ensuring that the region meets the 8-Hour Carbon Monoxide National Ambient Air Quality Standard (NAAQS) through 2022.