Clean Air Act Amendments: An Overview
(Archived document, may contain errors) 4 May 5, 1977 CLEMAtR ACTMNDMENTS: AN OERWEW BACKGROUN In 1970, Congress passed the Clean Air Act. The Act placed the primary responsibility for air quality on the shoulders of state governments. The Administrator of the EPA was charged with the responsibility of promulgating standards for "ambient air quality."
Source: heritage.org