The Clean Air Act was established in 1955. In 1970, the responsibility for setting airquality standards was switched from the state governments to the federal one. The EPA became responsible for dealing with all air pollution sources, including chemicals, motor vehicles and businesses. The Clean Air Act of 1990 required the emissions of sulfur dioxide and nitrogen, which comes from power plants, be reduced as a means of controlling acid rain. In the 1980s the use of chlorofluorocarbons (CFCs) that are found in aerosol cans were phased out as a means of reducing global warming. The 1990 amendments of the Clean Air Act required a phaseout of the selling and producing of CFC. The Clean Air Act of 1990 also required cars to use gasolines that burn cleaner and established stricter standards regarding auto emissions.