DRAFT Technical Support Document (TSD)Technical Support Document • February 6th, 2013
Contract Type FiledFebruary 6th, 2013Pursuant to section 107(d) of the Clean Air Act (CAA), EPA must initially designate areas as either “unclassifiable,” “attainment,” or “nonattainment” for the 2010 1-hour sulfur dioxide (SO2) primary national ambient air quality standard (NAAQS). The CAA defines a nonattainment area as one that does not meet the NAAQS or that contributes to poor air quality in a nearby area that does not meet the NAAQS. Table 1 below identifies the counties or portions of counties (or areas of Indian Country) in Tennessee that EPA intends to designate “nonattainment” based on monitored violations.