California’s ambient air quality standards classified North Coast as nonattainment for PM10. EPA designated portions of Sonoma County as marginal nonattainment for ozone.
ERCs are available for six different pollutants:
|Pollutant||Significant Emission Rates|
|Nitrogen oxides (NOx)||>40 tons/year|
|Reactive organic compounds (ROC)||>40 tons/year|
|Sulfur oxides (SOx)||>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. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in Sonoma County, the facility must obtain 110 tpy of ERCs to offset the increase in VOC emissions.
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