Northern Sonoma County Air Pollution Control District handles up to 3,000 permits annually for outdoor burning both in agricultural and residential areas. The district also issues several hundred permits annually for air pollution control equipment such as the types used at gas stations or power plants. Northern Sonoma County District, which encompasses Lake County, has one of the best ambient air quality conditions in the region and is in compliance with state and federal regulations according to Alex Saschin, air quality engineer with the agency.