About MDAQMD

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What is MDAQMD?

Stretched out over almost 20,000 square miles of California’s vast desert expanse, the Mojave Desert Air Quality Management District is geographically the second largest of the state’s 35 air districts. As the air pollution control agency for San Bernardino County’s High Desert and Riverside County’s Palo Verde Valley, the District has primary responsibility for regulating stationary sources of air pollution located within its jurisdictional boundaries. To this end, the District implements air quality programs required by state and federal mandates, enforces rules and regulations based on air pollution laws and educates businesses and residents about their role in protecting air quality.

 Mojave Desert Air Basin 2018 WEB-01


The MDAQMD lies within the Mojave Desert Air Basin, which encompasses desert portions of Kern, Los Angeles, Riverside and San Bernardino counties.

The District works to protect the health of nearly 600,000 residents by safeguarding the region's air quality. By partnering with the local communities and businesses, we implement regulations and programs to reduce air pollution and assist the region in attaining ambient air quality standards.

The MDAQMD is committed to attaining and maintaining healthful air quality while supporting strong and sustainable economic growth.

This is accomplished through a comprehensive and common-sense program of planning, regulation, compliance assistance, enforcement, monitoring and public education. 

The District consists of 40 dedicated staff members, including engineers, inspectors, planners, community relations and other professionals, under the direction of Executive Director/Air Pollution Control Officer Brad Poiriez. See our District Organizational Chart for a comprehensive view of our internal structure.

Communities within MDAQMD

The MDAQMD's boundaries encompass San Bernardino County's High Desert and the Palo Verde Valley of Riverside County. Air Monitoring staff operates and maintains six monitoring stations — Barstow, Hesperia, Phelan, Trona, Twentynine Palms and Victorville within the District's 20,000+ mile jurisdiction. Learn more about MDAQMD's jurisdiction and boundaries.

The District works to protect the health of over 550,000 county residents by protecting good air quality. By partnering with the local communities and businesses, we implement regulations and programs to reduce air pollution and assist the county in reaching all outdoor air quality standards.