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air pollution hong kong london los angeles lklv_00004212
air pollution hong kong london los angeles lklv_00004212

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    Breathing easy: How big cities battle air pollution

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Breathing easy: How big cities battle air pollution

CNN looks at the air pollution initiatives being adopted by three world cities to help clear the air.

Breathing easy: How big cities battle air pollution

CNN looks at the air pollution initiatives being adopted by three world cities to help clear the air.