• SO2 health and background information from the U.S. Environmental Protection Agency (USEPA)

• North Carolina SO2 Design Values from air quality monitoring

Designations

• 4/8/2013 - North Carolina's Recommendations for Air Quality Designations for the Sulfur Dioxide Standard

• 6/2/2011 - North Carolina SO2 Boundary Recommendation

• 4/12/2011 - North Carolina SO2 Draft Boundary Options

Implementation

• 6/29/2012 - NCDAQ's comments on USEPA's proposed SO2 implementation

• 12/8/2009 - NCDAQ's comments on USEPA's proposed SO2 standard