- The CAA requires the EPA to promulgate certain national ambient air quality standards (NAAQS) for airborne pollutants. The EPA must review and revise the NAAQS every five years. After the EPA sets a specific NAAQS, each state is responsible for implementing that standard by adopting a state implementation plan (SIP) which specifies the state’s chosen method for achieving or maintaining the NAAQS. The EPA must also approve the state’s plan.
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