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air pollution Alkali Inspectorate appliances atmospheric pollution authorities automatic bituminous coal black areas boiler plants British burning cancer carbon cent chimney chimney heights Clean Air Act coke collector combustion Committee concentration Conference cost Council cyclone dark smoke deposit discharge discussion domestic smoke draught effect efficiency electricity emitted engineers equipment factor filter flue gases fumes furnaces given grit and dust heating hydrocarbons ignition increase industrial installation London lung cancer manufactured maximum mechanical stokers ment methods million tons minutes National Coal Board open fire open grates operation oxide paper particles plume power stations pphm premium fuels present processes produced Public Health Inspectors reduce sampling Scotland Section smog smoke control areas smoke emission Smokeless Air smokeless zone Society solid fuel solid smokeless fuels steam steel sulphur dioxide technical temperature tion towns units velocity wind