Air Quality General

High Desert Air Quality Improves Significantly over Past 12 Years According to New Report

By Violette Roberts
Community Relations & Education Manager
Mojave Desert Air Quality Management District

The California Air Pollution Control Officers Association has released its annual air quality report California’s Progress Toward Clean Air for all 35 local air districts in the state, docu­menting dramatic reductions in un­healthy levels of fine particulate pol­lution in every county reporting air quality data.

Fine particulate pollution – also known as PM2.5 – is associated with a wide range of health effects from increased hospitalizations to premature deaths. The report also shows a general trend of improving air quality for ground-level ozone – the primary component of smog – although some counties and their air district face unique challenges in reducing levels of that pollutant.

The report contains statistical infor­mation on ozone and PM2.5 air qual­ity for 2000 and 2012 for each coun­ty; statewide air quality trends and detailed descriptions of air pollution control programs at each air quality district.

The High Desert portion of San Bernar­dino County – which is under the regu­latory authority of the Mojave Desert Air Quality Management District – was one of only eleven county regions in the state where no exceedances of the federal 24-hour PM 2.5 standard (35 micrograms/cubic meter) occurred in either 2000 or 2012. PM2.5 is pri­marily formed in the atmosphere from gases, such as sulfur dioxides, nitro­gen oxides and volatile organic com­pounds, and is also directly emitted into the air from fuel combustion and as fugitive dust.

The report also highlights a 19% de­cline in exceedances of the federal 0.075 part per million ozone stan­dard which occurred throughout the MDAQMD’s 20,000 square mile ju­risdiction during the last twelve years. In 2000, 84 days were recorded dis­trict wide, while in 2012, only 68 days occurred. Meanwhile, “good” Air Quality Index days measured in the High Desert between 2000 and 2012 increased from 173 to 184, respective­ly. AQI levels are considered good when levels on the color-coded report­ing scale fall between 0 and 50, and air pollution poses little or no risk.

“Thanks to our collaborative partner­ships with the regulated community and local residents, High Desert air quality continues to improve and serve as a top reason for businesses to relo­cate to the region,” said Eldon Heaston, Executive Officer for the MDAQMD, adding that the MDAQMD’s business-friendly approach to regulation serves as another strong incentive for indus­tries to consider the High Desert.

California and its individual air dis­tricts have made remarkable progress in cleaning the air during the past three decades in spite of dramatic increases in population and driving. From 1980 to 2010, the state’s population in­creased by 65 percent and daily miles driven by all vehicles increased by 137 percent. But thanks to a compre­hensive air pollution control strategy, smog-forming pollutants were cut by 55 percent during the same period. California’s largest industrial plants also cut their greenhouse gas emis­sions by 17 percent between 2008 and 2011.

These improvements have occurred in spite of the fact that neither the state nor local air districts have the author­ity to regulate federally controlled sources of air pollution, including ships, locomotives, and aircraft.

For a copy of California’s Progress Toward Clean Air, or to learn more about the High Desert’s air quality, visit

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