Actions for Clean Air Act Amendments of 1989. Part 1, September 21, 1989 : hearing before the Subcommittee on Environmental Protection of the Committee on Environment and Public Works, United States Senate, One Hundred First Congress, first session on S. 816, a bill to control the release of toxic air pollutants, to reduce the threat of catastrophic chemical accidents, and for other purposes and S. 196, a bill to control emissions of air pollutants from municipal waste incineration units, to provide for the safe disposal of ash produced by such units, and for other purposes