Mojave Air Quality Management District (MAQMD)

MAQMD is the air pollution control agency for San Bernardino County’s High Desert and Riverside County’s Palo Verde Valley. California’s ambient air quality standards classified Mojave Desert as nonattainment for ozone, PM10 and PM2.5 only for the southwest corner of desert portion of San Bernardino County only. EPA classified the southwest corner of desert portion of San Bernardino County as nonattainment for ozone and the whole county of San Bernardino as nonattainment for PM10.

ERCs are available for six different pollutants:

Pollutant Significant Emission Rates
Nitrogen oxides (NOx) >25 tons/year
Reactive organic compounds (ROC) >25 tons/year
Sulfur oxides (SOx) >25 tons/year
Carbon monoxide (CO) >100 tons/year
PM10 >15 tons/year
PM2.5 >12 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 a nonattainment area for ozone is 1.3 . That means if 100 tpy of NOx or ROC are emitted from a proposed new or modified major facility in the 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 shall be provided at a tradeoff ratio of 1.0.