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Chlorofluorocarbons (CFCs) : A group of inert chemical used in many industrial and everyday processes such as our refrigerators that are not broken down at lower atmospheric levels and rise to the upper levels, destroying ozone. They are water vapor, carbon dioxide, methane, nitrous oxide, ozone, CFCs, and hydrofluorocarbons.
Understanding the Endangerment Finding Two requirements must be met before a substance can be regulated under the Clean Air Act. First, it has to qualify as an airpollutant. The Clean Air Act defines an airpollutant to be any airpollution agent or combination of such agents, including any precursor chemicals.
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