Most Polluted Cities In The World

Iranian cities have some of the worst pollution in the world, with fine particle presence 20 times higher than the recommended upper limit. Photograph: Vahid Salemi/AP

Iran, India, Pakistan And Mongolia Have Most Polluted Cities In The World -- The Guardian

World Health Organisation's first global survey of fine particle pollutants says US and Canadian towns are among cleanest

Cities in Iran, India, Pakistan and Mongolia are among the worst on the planet for air pollution, while those in the US and Canada are among the best, according to the first global survey.

The Iranian city of Ahvaz had the distinction of the highest measured level of airborne particles smaller than 10 micrometres, according to the UN's World Health Organisation (WHO) survey.

Outdoor air pollution causes an estimated 1.34 million premature deaths a year, said WHO. Investments to lower pollution levels quickly pay off owing to lower disease rates and, therefore, lower healthcare costs, it said.

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