Program Information South Coast Air Quality Management District (SCAQMD) is an environmental regulatory agency. We serve a four-county region that includes all of Orange County, and parts of Los Angeles, Riverside and San Bernardino Counties. SCAQMD's headquarters is located in Diamond Bar. SCAQMD's mission is to protect public health from air pollution through a comprehensive program of planning, regulation, education, enforcement, compliance incentives, technical innovation, and promotion of public understanding of air quality issues.