level of pollution

• 污染水平

level of pollution的用法和样例：

例句

1. Studies on dynamics of microcystin pollution level in municipal water supplies.
   城市供水藻毒素污染水平的动态研究。
2. Thankfully, the air pollution levels were not especially bad yesterday.
   幸好昨天的空气污染水平不是特别严重。