We have air pollution, water pollution and land pollution.

我们有空气污染，水污染和土地污染。

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I have learnt that the problem of air pollution is universal and that we were likely to run out of some natural resources.

我了解到空气污染问题是全球性的，而且我们可能会耗尽一些自然资源。

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Air pollution will remain a problem for a long time, though we have done a lot to solve it.

尽管我们已经做了很多工作来解决空气污染问题，但它在很长一段时间内仍将是一个问题。

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On the horizontal axis of each graph, we have total traffic-related air pollution exposure, increasing in parts per billion (a part here would be a drop in a billion drops) from left to right.

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We have the technology to clean up the unhealthiest sources of air pollution, and my research reiterated for me that we can't afford to wait too long to clear the air.

WHITEHOUSE: Energy and Environment Latest News | The White House

Yet, despite all the evidence implicating both indoor and outdoor air pollution's harmful impact on public health, we still have so much to do to clean up our act.

WHITEHOUSE: Energy and Environment Latest News | The White House