Some spectators attending the 2008 Olympic Games in Beijing face serious health problems due to air pollution, a leading health expert has warned.
Dr Michal Krzyzanowski of the World Health Organisation told the BBC that those with a history of cardiovascular problems should take particular care.
He also said the city's poor air quality could trigger asthma attacks.
The warning came as Beijing began a four-day test scheme to take 1.3m vehicles off the city's roads. More
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