宣威县肺癌高发区用火塘烧烟煤造成室内空气严重污染。为改善室内空气污染,1977年该县在肺癌高发区来宾公社开展了改革火塘的试点。用普通型烟囱地炉代替无烟囱的火塘烧烟煤,室内空气污染物明显下降,能满足农民取暖、炊事等生活习惯和节煤。目前该公社已有60％农户使用烟囱地 Xuanwei County, a high incidence of lung cancer with hot pot burning bituminous coal caused by indoor air pollution. In order to improve indoor air pollution, in 1977, the county piloted a reform of Huotang County in the guest commune in a high incidence of lung cancer. Ordinary chimney furnace to replace the smokeless chimney burning bituminous coal, indoor air pollutants decreased significantly, to meet the farmers heating, cooking and other living habits and save coal. Currently, 60% of farmers in the commune use chimney land