the aim of reducing various gases by almost 90 percent. Third, the Act specifies standards for controlling auto emissions. Finally, the law encourages states to develop state implementation plans (SIP's) that would enable them to reach these standards. The states must involve the public, through hearings and opportunities to comment, in the development of each state implementation plan. The state plans would then have to be approved by the EPA. If a state chose not to form a SIP or did not complete it by a specified date, the EPA would take over the administration of the law for that state. The states!
             are also required to enforce the Clean Air Act. The United States government, through EPA, assists the states by providing scientific research, expert studies, engineering designs and money to support clean air programs (www.orau.gov).
             The Clean Air Act of 1970 was last amended on November 15, 1990, signed into law as P.L. 101-549. Although the 1990 Amendments significantly alter and add to the regulatory requirements of the Clean Air Act, the basic framework and procedural
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