Massachusetts Department of Environmental Protection (MassDEP)

Based on the 2008 8-hour Ozone Standard, EPA designated Dukes County as marginal nonattainment for ozone. However, on the 2015 Standard, Massachusetts is reclassified as attainment for ozone.

ERCs are available for six different pollutants:

Pollutant Significant Emission Rates
Nitrogen oxides (NOx) >40 tons/year
Volatile organic compounds (VOC) >40 tons/year
Sulfur dioxide (SO2) >40 tons/year
Carbon monoxide (CO) >100 tons/year
PM10 >15 tons/year
PM2.5 >10 tons/year
PM >25 tons/year

New or modified major facilities in nonattainment areas must obtain ERCs to satisfy the offset ratio requirements for proposed emission increases. Considering the 2008 8-hour Ozone Standard, Dukes County is in marginal nonattainment for ozone and the offset ratio for this nonattainment designation is 1.1 to 1. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in Dukes County, the facility must obtain 110 tpy of ERCs to offset the increase in VOC emissions.

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