California’s ambient air quality standards classified Sacramento Metro as nonattainment for ozone and PM10. Butte County is nonattainment for PM2.5. EPA designates the Sacramento Metro as severe nonattainment for ozone while some parts were designated as nonattainment for PM2.5.
ERCs are available for four different pollutants:
|Pollutant||Significant Emission Rates|
|Nitrogen oxides (NOx)||>25 tons/year|
|Reactive organic gases (ROG)||>25 tons/year|
|Carbon monoxide (CO)||>25 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 severe nonattainment area for ozone is 1.3. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in Sacramento Metropolitan, the facility must obtain 130 tpy of ERCs to offset the increase in VOC emissions.
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