EPA designated Davis, Salt Lake, parts of Tooele and Weber Counties in Northern Wasatch Front, portions of Utah County in Southern Wasatch Front, and parts of Duchesne and Uintah Counties in Uinta Basin as marginal nonattainment for ozone. In addition, parts of Weber County and City of Ogden in Ogden, Salt Lake County and Utah County were classified as moderate nonattainment for PM10.
UDEQ’s Emission Banking and Trading Program facilitates trading of ERCs within the state. ERCs are available for six different pollutants:
|Pollutant||Significant Emission Rates|
|Nitrogen oxides (NOx)||>40 tons/year|
|Volatile organic material (VOM)||>40 tons/year|
|Sulfur dioxide (SO2)||>40 tons/year|
|Carbon monoxide (CO)||>100 tons/year|
To satisfy offset requirements, new or modified major facilities in nonattainment areas must obtain ERCs to satisfy the offset ratio requirements for proposed emission increases. The offset ratios 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 Southern Wasatch Front, and parts of Duchesne and Uintah Counties in Uinta Basin, which are classified as marginal nonattainment for ozone, the facility must obtain 110 tpy of ERCs to offset the increase in VOC emissions.
On the other hand, offset ratio for the parts of Weber County and City of Ogden in Ogden, Salt Lake County and Utah County, classified as moderate nonattainment area for PM10, is 1.15. Thus, for 100 tpy of PM10 emitted from a proposed new or modified major facility in the city of Ogden and counties of Weber, Salt Lake, and Utah, the facility must obtain 115 tpy of ERCs to offset the increase in PM10 emissions.
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