“440. Hazardous. Health alert: everyone may experience more serious health effects, please avoid physical exertion and outdoor activities.”
Tweet from US embassy air pollution monitor, Beijing, 3pm, Tuesday Feb. 25, 2014
Before they even look out the window in the morning, many Beijingers have checked a smartphone app to see the pollution index for the day. Any reading below 100 offers a dose of reassurance – even though it is still well above ideal levels – but above that and pollution is the main topic of the day.
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