EPA designated all counties in Rhode Island as attainment for all criteria pollutants. However, Rhode Island is located in the Ozone Transport Region, which is why RIDEM still maintains nonattainment new source reviews that applies to new major stationary sources or major modification of NOx or VOC. Offsetting of emissions of criteria pollutants also helps in limiting degradation of air quality in areas that are currently in attainment of the NAAQS.
ERCs are available for six different pollutants:
|Pollutant||Significant Emission Rates|
|Nitrogen oxides (NOx)||>25 tons/year|
|Volatile organic compounds (VOC)||>25 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 the Ozone Transport Region, the facility must obtain 110 tpy of ERCs to offset the increase in VOC emissions.
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