The Clean Air Act, established by the EPA in 1970, has had two major sets of revisions, the first in 1977 and the second in 1990. The 1977 ammendments authorized provisions for the Prevention of Significant Deterioration (PSD) which analyzes new and existing pollutants and it authorized provisions for non-attainment areas, areas that consistently have pollution levels exceeding the National Ambient Air Quality Standards. In 1990, ammendments authorized Acid Deposition Control programs, a program to control 189 toxic pollutants including those in the National Emission Standards for Hazardous Air Pollutants list and permit program requirements, along with expanding provisions related to the National Ambient Air Quality Standards and enforcement authority.
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