The MDAQMD's boundaries encompass San Bernardino County's High Desert and the Blythe portion of Riverside County. Air Monitoring staff operates and maintains six monitoring stations (Barstow, Hesperia, Phelan, Trona, Twentynine Palms, & Victorville) within the District's 20,000 + mile jurisdiction. For a complete listing of cities within the MDAQMD's jurisdiction, click here. This map and associated files are provided for information purposes only. For an official determination of location for air quality purposes please contact the MDAQMD.
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