North Coast Unified Air Quality Management District (NCUAQMD)

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
PM10 >15 tons/year
PM2.5 >10 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.

Emission Advisors assists clients in tackling challenges in the environmental markets. Please contact Emission Advisors to discuss your specific needs and how we can help.​