Where there were trees that cleaned our air are now factories that poison it.

曾经为我们净化空气的森林，如今成为了一座座污染大气的工厂。

Chinese authorities have cleaned the air for special events in the past, as well.

过去，为了成功举办一些重大活动，中国相关部门也会着手净化空气。

That’s how we cleaned up our air and our water.

这就是我们净化空气和水的方式。