Clean Air Act (CAA)
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- The comprehensive federal law which regulates air emissions. The goal of the law was to develop a national ambient air quality standard (NAAQS) that protects public health and the environment. The original CAA was passed in 1963, but the national air pollution control program is actually based on the 1970 version of the law. The 1990 CAA Amendments, in large part, were intended to deal with previously unaddressed or under-addressed problems such as acid rain, ground level ozone, ozone depletion, and air toxics.