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Air Quality

South Carolina 1997 8-Hour Ozone Attainment Demonstration
Charlotte-Gastonia-Rock Hill, North Carolina-South Carolina (Metrolina) State Implementation Plan (SIP)

In addressing the May 8, 2009, Finding of Failure to Submit, DHEC worked with the U.S. Environmental Protection Agency (EPA)'s Region 4 and the interagency consultation partners on a revised attainment demonstration based on updated modeling.

In the fall of 2009, EPA presented as an option resubmittal of the original attainment demonstration submitted in 2007, along with additional information to include 2011 modeling and actual air quality data from 2009. (Please note that the Metrolina air quality measurements for 2009 indicate that the fourth highest value at each monitor is well below the 1997 8-hour ozone standard.)

In lieu of submitting a revised South Carolina attainment demonstration for the Metrolina nonattainment area, as had been considered, DHEC has requested that EPA accept the previously submitted attainment demonstration for the Metrolina nonattainment area. In response to DHEC's decision, EPA is requiring additional information. A supplement was prepared as directed by EPA. It includes:

  • Attainment modeling for 2011,
  • Updates to the air quality data analysis including the 2009 ambient data,
  • Additional updated information on emissions and controls that would affect the air quality for the 2010 ozone season, and
  • A Volatile Organic Compound (VOC) motor vehicle emissions budget (MVEB).
  • A 2008 VOC MVEB for the Reasonable Further Progress (RFP) appendix.

Withdrawal of portions of the 1997 8-hour Ozone Attainment Demonstration for the Metrolina nonattainment area (January 12, 2012)

Supplement to the South Carolina 8-Hour Ozone Attainment Demonstration (April 29, 2010)

South Carolina 8-Hour Ozone Attainment Demonstration State Implementation
Plan (April 29, 2010)


Appendix G - Quality Assurance of the Emissions Inventories

Appendix M 2 - Adopted State Control Measures

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