California’s ambient air quality standards classified San Joaquin Valley as nonattainment for ozone, PM2.5 and PM10. EPA designated San Joaquin Valley as extreme nonattainment for ozone. Extreme nonattainment areas for ozone include counties of Fresno, portions of Kern, Kings, Madera, Merced, San Joaquin, Stanislaus and Tulare.
ERCs are available for six different pollutants:
|Pollutant||Significant Emission Rates|
|Nitrogen oxides (NOx)||>10 tons/year|
|Reactive organic gases (ROG)||>10 tons/year|
|Sulfur oxides (SOx)||>27 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 extreme nonattainment area for ozone is 1.5. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in the above-mentioned counties classified as extreme nonattainment for ozone, the facility must obtain 150 tpy of ERCs to offset the increase in VOC emissions.
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