The San Diego County Air Pollution Control District (District) strives to protect the public from the harmful effects of air pollution, achieve and maintain air quality standards, foster community involvement and develop and implement cost-effective programs meeting state and federal mandates, considering environmental and economic impacts. The District is entrusted with regulating stationary (fixed) sources of air pollution, which can include anything from large power plants and factories to the corner gas station. The District is governed by the Air Pollution Control Board. The Air Pollution Control Board adopts measures to control air pollutants from stationary sources of air pollution. The Board also provides millions of dollars in grant funding to incentivize the reduction of air pollutants from diesel vehicles and equipment through retrofits and the replacement dirty, old equipment with clean, and low emitting devices. San Diego County continues to make great progress in overcoming what historically has been the region’s primary air pollution problem – ozone. In 2013, San Diego County’s air quality was the best ever since the mid-1950’s when the District first started measuring air pollutants.