2 sentences

1. 工业废水中含有大量的污染物。

   gōng​yè fèi​shuǐ zhōng hán​yǒu dà​liàng de wū​rǎn​wù.

   Industrial wastewater contains a large amount of pollutants.

   Source: Dong Chinese Dictionary

2. 二氧化硫是一种常见的空气污染物。

   èr​yǎng​huà​liú shì yī zhǒng cháng​jiàn de kōng​qì wū​rǎn​wù.

   Sulfur dioxide is a common air pollutant.

   Source: Dong Chinese Dictionary