<P> The 1970 law is sometimes called the "Muskie Act" because of the central role Maine Senator Edmund Muskie played in drafting the bill . </P> <P> To implement the strict new Clean Air Act of 1970, during his first term as EPA Administrator William Ruckelshaus spent 60% of his time on the automobile industry, whose emissions were to be reduced 90% under the new law . Senators had been frustrated at the industry's failure to cut emissions under previous, weaker air laws . </P> <P> The Clean Air Act Amendments of 1977 required Prevention of Significant Deterioration (PSD) of air quality for areas attaining the NAAQS and added requirements for non-attainment areas . </P> <P> The 1990 Clean Air Act added regulatory programs for control of acid deposition (acid rain) and stationary source operating permits . The amendments moved considerably beyond the original criteria pollutants, expanding the NESHAP program with a list of 189 hazardous air pollutants to be controlled within hundreds of source categories, according to a specific schedule . The NAAQS program was also expanded . Other new provisions covered stratospheric ozone protection, increased enforcement authority and expanded research programs . </P>

The clean air act requires all of these except