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Clean Air Act -- State Implementation Plans

The Environmental Protection Agency (EPA) and the states and territories of the United States share responsibility for developing and enforcing regulations under the Clean Air Act (CAA). CAA regulations protect the public from airborne contaminants that are known to be hazardous to human health. EPA may permit individual states to enforce compliance with CAA requirements within their own borders. Participating states must write and submit a state implementation plan (SIP) to the EPA for approval. A SIP is a collection of the regulations a state will use to clean up polluted areas. The states are obligated to notify the public of these plans, through hearings that offer opportunities to comment on the development of each state implementation plan.

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