The report also details a little-discussed cause of respiratory death — indoor air pollution from cooking stoves, fires and secondhand cigarette smoke.
该报告还详细介绍了一些鲜为人知的呼吸道疾病死亡病因：炉灶、火灾和二手烟引起的室内空气污染。
We normally associate air pollution with smokestacks and cars, but volcanoes, forest fires, dust storms, marshes, oceans, and plants also add to the air chemicals we consider pollutants.
我们常常将空气污染与烟囱和汽车联系在一起，但事实上火山、森林火灾、沙暴、沼泽、海洋和植物都会带来一些我们认为是大气污染物的化学物质。
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