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, follow the link below.
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