is reasonably available considering technological and economic feasibility” (44 FR 53762, September 17, 1979). Sections 182(f) and 184(b)(2) of the Clean Air Act (CAA) require states with ozone areas, classified as moderate, serious, severe, and extreme--as well as all areas in the Ozone Transport Region (OTR)--to implement RACT for existing major stationary sources of NOX. C. NOX RACT Applicability Section 302 of the CAA defines a major stationary source as any facility which has the potential to emit of 100 tons per year (tpy) of any air pollutant. Section 182 of the CAA reduces the major stationary source potential to emit threshold for certain ozone nonattainment classifications: 50 tpy for serious areas; 25 tpy for severe areas; and 10 tpy for extreme areas. The anti-backsliding provisions of the CAA require an area to continue to apply their historical most stringent major source threshold. Current and historical area classifications may be found in the EPA Green Book online at . RACT Major Stationary Source Thresholds (lowest historical value generally applies) NOX Emissions Area (potential to emit; tpy) Ozone Transport Region 100 Moderate ozone nonattainment Serious ozone nonattainment 50 Severe ozone nonattainment 25 Extreme ozone nonattainment 10
is reasonably available considering technological and economic feasibility” (44 FR 53762, September 17, 1979). Sections 182(f) and 184(b)(2) of the Clean Air Act (CAA) require states with ozone areas, classified as moderate, serious, severe, and extreme--as well as all areas in the Ozone Transport Region (OTR)--to implement RACT for existing major stationary sources of NOX. C. NOX RACT Applicability Section 302 of the CAA defines a major stationary source as any facility which has the potential to emit of 100 tons per year (tpy) of any air pollutant. Section 182 of the CAA reduces the major stationary source potential to emit threshold for certain ozone nonattainment classifications: 50 tpy for serious areas; 25 tpy for severe areas; and 10 tpy for extreme areas. The anti-backsliding provisions of the CAA require an area to continue to apply their historical most stringent major source threshold. Current and historical area classifications may be found in the EPA Green Book online at . RACT Major Stationary Source Thresholds (lowest historical value generally applies) Area NOX Emissions (potential to emit; tpy) Ozone Transport Region 100 Moderate ozone nonattainment Serious ozone nonattainment 50 Severe ozone nonattainment 25 Extreme ozone nonattainment 10
White_Paper_NOx_RACT_09072016.docx