A State Implementation Plan (SIP) outlines procedures for a state to implement, monitor, and enforce the NAAQS but not the NESHAP.

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A State Implementation Plan (SIP) is primarily focused on how a state plans to comply with the National Ambient Air Quality Standards (NAAQS) set by the EPA to protect public health. The National Emission Standards for Hazardous Air Pollutants (NESHAP) are regulated at the federal level by the EPA, and while states may have roles in enforcing these standards, the SIPs are specifically designed for NAAQS compliance.

A State Implementation Plan (SIP) Outlines Procedures for a State