EPA Air · nonattainment areas, by county

Air-emissions sources in St. Louis County, Missouri

• 502Facilities

St. Louis County, Missouri is designated nonattainment or maintenance for at least one national ambient air-quality standard, so a new or expanding source here faces stricter permitting than the same source would in a county that meets every standard. The designation belongs to the county, not to any facility on this page.

By emissions classification in St. Louis County

• Minor source 461
• Synthetic minor source 17
• Emissions classification unknown 13
• Major source 9

Facilities

Designation from EPA’s Green Book national nonattainment dataset, joined on state and county. Figures from EPA’s ICIS-AIR download.