这本书展示了一些简单的事情，你可以做以减少汽车造成的污染。

The book shows simple things you can do to reduce ___pollution from your car.

这份宣言包含了应对交通拥堵和环境（污染）的严厉措施。

The manifesto includes tough measures to tackle road congestion and environmental ___pollution.

这里的污染比城市少，而且也更安静。

There is less ___pollution than in the city and it is quieter too.