PA designated parts of Clark County (Hydrographic Area 212 which includes Las Vegas Valley) as marginal nonattainment for ozone. In addition, some parts of Clark County and Washoe County were classified as serious maintenance for PM10.
Clark County established rules that requires major sources of NOx, VOC, CO and particulate matter (PM) in nonattainment areas to obtain emission offsets. The ERC program is facilitated by the Clark County Department of Air Quality and Environmental Management.
ERCs are available for five different pollutants:
|Pollutant||Significant Emission Rates|
|Nitrogen oxides (NOx)||>40 tons/year|
|Volatile organic compounds (VOC)||>40 tons/year|
|Carbon monoxide (CO)||>50 tons/year|
To satisfy the offset ratio requirements, new or modified major facilities in nonattainment areas must obtain ERCs for proposed emission increases. Marginal nonattainment area for ozone has offset ratio equal to 1.1 to 1. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in Clark County, it must obtain 110 tpy of ERCs to offset the increase in VOC emissions.
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