ARB has 60 sites statewide. One site is state-owned and the remaining 59 sites are leased. Of these sites, 43 support air-monitoring stations and 17 sites support an array of vehicle testing, research, planning, enforcement, chemical laboratory, support services, and administrative needs. These sites serve a multitude of programs the ARB oversees to support its statutory authority to attain and maintain healthy air quality, reduce the public's exposure to toxic air pollutants, conduct research into the causes of and solutions to air pollution, and support the ARB's leadership role related to greenhouse gas reduction and climate change.