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 28. A lot of policy development work is needed. This should proceed hand in hand with accelerated research to reduce remaining scientific uncertainties. Nations urgently need to formulate and agree upon management policies for all environmentally reactive chemicals released into the atmosphere by human activities, particularly those that can influence the radiation balance on earth. Governments should initiate discussions leading to a convention on this matter.

29. If a convention on chemical containment policies cannot be implemented rapidly, governments should develop contingency strategies and plans for adaptation to climatic change. In either case, WMO, UNEP, WHO, ICSU, and other relevant international and national bodies should be encouraged to coordinate and accelerate their programmes to develop a carefull, integrated strategy of research, monitoring, and assessment of the likely impacts on climate, health, and environment of all environmentally reactive chemicals released into the atmosphere in significant quantities.

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2. Reducing Urban-Industrial Air Pollution
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30. The past three decades of generally rapid growth worldwide have seen dramatic increases in fuel consumption for heating and cooling, automobile transport, industrial activities, and electricity generation. Concern over the effects of increasing air pollution in the late 1960s resulted in the development of curative measures, including air-quality criteria, standards, and add-on control technologies that can remove pollutants cost-effectively. All these greatly reduced emissions of some of the principal pollutants and cleaned air over many cities. Despite this, air pollution has today reached serious levels in the cities of several industrial and newly industrialized countries, as well as in those of most developing countries, which in some cases are by now the world's most polluted urban areas.

31. The fossil fuel emissions of principal concern in terms of urban pollution, whether from stationary or mobil sources, include sulphur dioxide, nitrogen oxides, carbon monoxide, various volatile organic compounds, fly ash, and other suspended particles. They can injure human health and the environment, bringing increased respiratory complaints, some potentially fatal. But these pollutants can be contained so as to protect human health and the environment and all governments should take steps to achieve acceptable levels of air quality.

32. Governments can establish and monitor air quality goals and objectives, allowable atmospheric loadings, and related emission criteria or standards, as some successfully do already. Regional organizations can support this effort. Multilateral and bilateral development assistance agencies and development banks should encourage governments to require that the most energy-efficient technology be used when industries and energy utilities plan to build new or extend existing facilities. /…