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。
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.
大气气溶胶物质来源研究是大气污染研究极为重要的内容，它对污染物质的追踪评价具有较大的意义。
It is very important to study sources of aerosols in researching air pollution and chasing and appraising pollutants.
大气气溶胶物质来源研究是大气污染研究极为重要的内容，它对污染物质的追踪评价具有较大的意义。
It is very important to study sources of aerosols in researching air pollution and chasing and appraising pollutants.
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