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Air Quality

Regulation and SIP Management

State Implementation Plan

The State Implementation Plan (SIP) is developed to show how a state will meet the National Ambient Air Quality Standards (NAAQS) for six common pollutants, called "criteria pollutants," as set forth by the Clean Air Act.

A SIP is the accumulated record of many documents that form a blueprint and timeline for the state's plans to assure compliance with the NAAQS for criteria pollutants (carbon monoxide, sulfur dioxide, ozone, nitrogen dioxide, lead, and particulate matter), as outlined in the Clean Air Act. SIPs include, among other things, control plans, regulations, inventories of emissions within the state, and transcripts of public involvement in the SIP-development process. Once approved, the SIP is enforceable by the state and EPA. Elements of South Carolina's SIP have been in place since 1972. Though there have been many amendments, there is only one South Carolina SIP. For more information, see EPA's SIP webpage.

Maintenance Plans

An area that was once designated as nonattainment, but has been redesignated as attainment, must submit a maintenance plan, as required by section 175A of the Clean Air Act. South Carolina has submitted maintenance plans for two areas of the state, Cherokee County and the York County portion of the Charlotte-Gastonia-Rock Hill NC-SC nonattainment area. For more information see, the Ozone SIP-Maintenance Plan webpages.


For more information please contact the Bureau of Air Quality at (803) 898-4123 or by email.