Shock figures to reveal deadly toll of global air pollution
by John Vidal and Toby Helm from on (#10X8V)
World Health Organisation describes new data as 'health emergency', with rising concern likely to influence decision over Heathrow expansion
The World Health Organisation has issued a stark new warning about deadly levels of pollution in many of the world's biggest cities, claiming poor air quality is killing millions and threatening to overwhelm health services across the globe.
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