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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.

Attainment Demonstrations

The Clean Air Act requires that states submit attainment demonstrations for nonattainment areas to show that the area will attain and can continue to attain the NAAQS for which it was in nonattainment. For more information on the attainment demonstration for the York County portion of the Charlotte-Gastonia-Rock Hill NC-SC (Metrolina) nonattainment area for the 1997 Ozone NAAQS, see our Metrolina Attainment Demonstration website.

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