Details are given explaining how particle size, adsorption, and respiratory deposition profiles combine to determine aerosol toxicity. (DT)

Solutions for environmental noise pollution lie in systematic study of many basic processes such as reflection, scattering, and spreading. Noise propagation processes should be identified in different situations and assessed for their relative importance. (PS)

An experimental and theoretical investigation into the range and nature of exposure of the nonsmoking public to respirable suspended particulates from cigarette smoke is reported. An assessment of public health policy implications is presented. (Author/RE)

It is suggested that a system of relative standards be formulated which would compare utility of substances to their relative risk as carcinogens. This would define a range of use restrictions. Substances intended for specific uses would then be regulated according to these standards. (Author/RE)