Delaware Department of Natural Resources and Environmental Control (DNREC)

EPA designated the counties of New Castle and Sussex as marginal nonattainment for ozone.
ERCs are available for two different pollutants that exceed the significant threshold set by DNREC:

Pollutant New Castle Kent Sussex
Nitrogen oxides (NOx) >25 tons per year >25 tons per year >50 tons per year
Volatile organic compounds (VOC) >25 tons per year >25 tons per year >100 tons per 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 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 New Castle and Sussex Counties, the facility must obtain 110 tpy of ERCs to offset the increase in VOC emissions.

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