Contemporary debate over major clean air issues has kept the control of nitrogen oxides (NOJ in the forefront of public interest. While amendments to the Clean Air Act, new rules, programs, and policies emerge in response to concern for acid deposition, ozone non-attainment, global warming, and public health and welfare, it is anticipated that NO, control technology wiU be applied to a greater degree. However, existing regulations, policy and market forces are already forcing technological aduances. This article presents a sumnary of the current regulatory situation and looks ahead at the Clean Air act reauthorization.The article also presents an o v e h of stationary source control for NO, emissions.

The following two articles [Seibert et al. and Govind et al.] were originally scheduled to appear in our special issue featuring Innovative Hazardous Waste Treatment which was published in December 1990. We were obliged to delay publication due to space constraints. Toxic Trace PollutantsFrom Incineration Paul C. Siebert, Denise R. Alston,

There is virtually no information published on the absolute efficiency of baghouses in reducing the emmisions of fine particles of asbestos. This lack of information is unfortunate because serious occupational health problems may result from the common practice of recirculating air to conserve energy. Emission testing has been conducted at five asbestos processing plants where the emissions are controlled by baghouses. The results showed that the mass removal efficiency frequently exceeded 99.00%. Membrane filter samples of the effluent were examined by optical and electron microscope. It was observed that despite the high mass efficiency, the number of fibers emitted, which were greater than 1.5 mum in length, was about 10(4)-10(5) fibers/m3, while the number of fibers less than 1.5 mum was 10(7)-10(8) fibers/m3. The significance of the size of the fibers in terms of probably health impact is briefly discussed.

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