当前我国空气污染问题日益严峻，汽车排放有害污染物是污染的重要来源。

Now the pollution become more serious, the exhaust of the car is the main source.

youdao

当前我国空气污染问题日益严峻，汽车排放有害污染物是污染的重要来源。

Now the pollution become more serious, the exhaust of the car is the main source.

youdao