EPA Finalizes Determinations for PM10 Attainment Areas in Montana and Colorado

Summary

The Environmental Protection Agency (EPA) has finalized determinations that the Whitefish, Montana, and Thompson Falls, Montana, and Steamboat Springs, Colorado, areas meet the national standards for particulate matter with an aerodynamic diameter less than or equal to 10 microns (PM10). The EPA made the determinations based on quality assured air quality monitoring data from 1997 to 2000, meeting the Clean Air Act's deadlines for these areas.