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State Implementation Plans (SIPs)

All Colorado communities are currently in attainment of all National Ambient Air Quality Standards except the Front Range ozone control area, which is nonattainment for the eight-hour ozone standard.
 
Map of nonattainment and attainment/maintenance areas
State Implementation Plans
The plans linked below show how communities that once violated federal clean air standards have attained and will maintain those standards.
 
Aspen
Cañon City
Colorado Springs
Denver
Fort Collins
Greeley
Lamar
Longmont
Pagosa Springs
Steamboat Springs
Telluride
 
If a plan you’re seeking isn’t listed here, please e-mail us:
cdphe.commentsapcd@state.co.us
More information