Georgia Department of Natural Resources Environmental Protection Division

Georgia’s ERC program facilitates construction permitting for major emission sources that are subject to Nonattainment New Source Review (NSR) permitting in the 20-county Atlanta nonattainment area which consists the counties of Barrow, Bartow, Carroll, Cherokee, Clayton, Cobb, Coweta, Dekalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Hall, Henry, Newton, Paulding, Spalding, Rockdale and Walton counties.

Based on the 2015 8-Hour Ozone Standard, the counties of Bartow, Clayton, Cobb, DeKalb, Fulton, Gwinnett and Henry were in marginal nonattainment for ozone.

Moreover, emissions point sources within the 25-county area surrounding Atlanta that require Best Available Control Technology (BACT) + offset permitting are also eligible. This includes counties of Banks, Butts, Chattooga, Clarke, Dawson, Floyd, Gordon, Haralson, Heard, Jackson, Jasper, Jones, Lamar, Lumpkin, Madison, Meriwether, Monroe, Morgan, Oconee, Pickens, Pike, Polk, Putnam, Troup, and Upson.

ERCs are available for NOx and VOC.

County or Area Pollutant Emission Rates
Cherokee, Clayton, Cobb, Coweta, Dekalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding and Rockdale. Nitrogen oxides (NOx)
Volatile organic compounds (VOC)
>25 tons/year
>25 tons/year
Barrow, Bartow, Carroll, Hall, Newton, Spalding and Walton Nitrogen oxides (NOx)
Volatile organic compounds (VOC)
>100 tons/year
>100 tons/year
Electrical generating units in Banks, Butts, Chattooga, Clarke, Dawson, Floyd, Gordon, Haralson, Heard, Jackson, Jasper, Jones, Lamar, Lumpkin, Madison, Meriwether, Monroe, Morgan, Oconee, Pickens, Pike, Polk, Putnam, Troup and Upson Nitrogen oxides (NOx) >100 tons/year

New or modified major facilities in nonattainment areas must obtain ERCs to satisfy the offset ratio requirements for proposed emission increases. The offset ratio for marginal nonattainment area for ozone is 1.1 to 1. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in a marginal nonattainment area for ozone, the facility must obtain 110 tpy of ERCs to offset the increase in VOC emissions.

Additionally, the offset ratio for moderate nonattainment area for PM10 is 1.15. That means if 100 tpy of for PM10 are emitted from a proposed new or modified major facility in a moderate nonattainment area for for PM10, the facility must obtain 115 tpy of ERCs to offset the increase in for PM10 emissions. For serious nonattainment areas, offset ratio is 1.2. Thus, the counties of Maricopa and Pinal in Phoenix being serious nonattainment for PM10 are required to obtain 120 tpy of ERCs to offset the increase in PM10 emissions.