Air pollution affects tree growth in Sao Paulo

As well as causing significant harm to human health, air pollution also stunts the growth of trees, one of the elements that can attenuate this typically urban environmental problem.

Delhi homeless to be given masks as smog worsens: official

New Delhi's homeless will be given cotton masks to help them survive in the world's most polluted major city, officials said Monday, although experts said the basic coverings would be useless against deadly smog particles.

China fights big smog with big air purifier

China has a found a novel way to tackle its massive air pollution problem: Putting up a giant air purifier the size of an industrial smokestack in the middle of a smog-plagued city.

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