Tai chi practitioners don masks for their early morning exercise in Pingquan county, Hebei province on Tuesday. Photo: Xinhua

Cities in north China blanketed in smog on final days of national “golden week” holidays

Forecast arrival of cold front on Wednesday expected to clear the air at last

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Tai chi practitioners don masks for their early morning exercise in Pingquan county, Hebei province on Tuesday. Photo: Xinhua
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