Mojave Air Quality Management District (MAQMD)

MAQMD encompasses counties Kern, Los Angeles, San Bernardino and Riverside. California’s ambient air quality standards classified Mojave Desert as nonattainment for ozone, PM10 and nonattainment for PM2.5 for the potion of San Bernardino County. EPA designated some parts of San Bernardino County as severe nonattainment for ozone while various parts of Riverside County have different nonattainment designation. The Morongo Band of Mission Indians was designated as serious nonattainment, the Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation was classified as moderate nonattainment and Coachella Valley as severe nonattainment.

ERCs are available for six different pollutants:

Pollutant Significant Emission Rates
Nitrogen oxides (NOx) >25 tons/year
Volatile organic compounds (VOC) >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 moderate nonattainment area for ozone is 1.15. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in the above-mentioned counties classified as moderate nonattainment for ozone, the facility must obtain 115 tpy of ERCs to offset the increase in VOC emissions. On the other hand, offset ratio for aserious nonattainment area for ozone is 1.2. Thus, for 100 tpy of VOC emitted from a proposed new or modified major facility located in the Morongo Band of Mission Indians, the facility must obtain 120 tpy of ERCs to offset the increase in ozone emissions. For areas designated as severe nonattainment for ozone such as San Bernardino and Coachella Valley, offsets must be provided at 1.3, which means 130 tpy of VOC ERCs are needed to offset 100 tpy of increase in VOC emissions.

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