Ventura County Air Pollution Control District (VAPCD)

California’s ambient air quality standards classified Ventura County as nonattainment for ozone and PM10. Based on EPA standards, the county was designated nonattainment for the 2008 federal 1-hour and 8-hour ozone standards.

ERCs are available for four different pollutants:

Pollutant Significant Emission Rates
Nitrogen oxides (NOx) >100 tons/year (attainment, marginal or moderate);
>25 tons/year (severe); >10 tons/year (extreme)
Reactive organic compounds (ROC) >100 tons/year (attainment, marginal or moderate);
>25 tons/year (severe); >10 tons/year (extreme)
Sulfur oxides (SOx) >100 tons/year
PM10 >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 ratio for nonattainment area for ozone is 1.3 That means if 100 tpy of NOx or ROCs are emitted from a proposed new or modified major facility situated in an area classified as nonattainment for ozone, the facility must obtain 130 tpy of ERCs to offset the increase in NOx or ROC emissions. Offsets for PM10 and SOx shall be provided at a tradeoff ratio of 1.1.