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A State Implementation Plan (SIP) is a federal plan for state compliance with the federal Clean Air Act, administered by the Environmental Protection Agency. The State Implementation Plan consists of narrative, rules, technical documentation and agreements that an individual state will use to clean up polluted areas.
Colorado State Implementation Plan (SIP).Other information can be found on the Colorado Air Pollution Control Division's State Implementation Plan site.
Current National Ambient Air Quality Standards (NAAQS).
EPA Region 8 air quality hot topics.
Attainment/Maintenance Plans for Colorado communities.