1. Sulphur dioxide is a pollutant and a major contributor to acid rain. 二氧化硫是一种污染物,并且是形成酸雨的主要因素。
2. Nitrogen dioxide is a pollutant emitted by automobiles. 二氧化氮是汽车排放的一种污染物。
3. Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants. 二氧化硫是酸雨的主要成因之一,它是一种特别严重的污染物,因为它会降低呼吸系统处理其他污染物的能力。
4. The peroxyacetyl nitrate is an important atmospheric pollutant. 过氧乙酰硝酸盐是一种重要的大气污染物。
5. Coal itself is a heavy pollutant. 煤本身就是一种严重的污染物。