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http://www.theguardian.com/world/gallery/2013/oct/21/china-pollution#/?picture=420527255&index=1

Smog levels in northern China – in pictures

Schools and an airport are closed in Harbin as the density of airborne particles is several times above World Health Organisation recommended limits

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• theguardian.com, Monday 21 October 2013 13.07 BST

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A woman wearing a mask checks her phone in front of Harbin's landmark San Sophia church. The second day of heavy smog has forced the closure of schools and highways, as visibility has been reduced to a few metresPhotograph: Reuters

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World news

• China

Environment

• Pollution

Weather

• Harbin

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  Chinese city paralysed by smog
  In parts of Harbin, the PM2.5 measure of air pollution reaches 1,000 – more than three times the hazardous level
• Chinese pollution study 'blocked on grounds of state secrecy'

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