China: record smog levels shut down city of Harbin

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Record levels of pollution have shut down the Chinese city of Harbin on Monday.

The World Health Organisation recommends daily levels of particulate matter with a diameter of 2.5 micrometers to be no more than twenty. Anything above 300 is considered dangerous. Levels around 1,000 were recorded in some parts of Harbin. All schools were shut and the airport was closed.
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