Trees can provide us with clean air?

Each outdoor air pollution to year joined three million premature deaths - so is the greatest risk to the environment and health in the world.

A study by Dr. David Nowak, a researcher with the US Forest Service showed that trees reduce only the urban air pollution on 1%. But even this small reduction can have tremendous health benefits.

Listen Crowd Science: Trees can help us to combat the pollution of the air?

For more information, I can breathe on the BBC World Service

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