Car exhaust has seriously polluted the air and people's health is greatly endangered.
汽车废气已经严重污染了空气，人们的身体受到了严重威胁。
The air in the city is seriously polluted.
这个城市的空气污染很严重。
The polluted air in the city seriously endangers the people's health.
城市中污染的空气严重地危及人民的健康。
In my hometown, the air is polluted seriously.
在我的家乡，空气污染十分严重。
Our air is seriously polluted.
我们的空气污染严重。
Our air is seriously polluted.
我们的空气污染严重。
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