People in Beijing and many other cities in northern China are back wearing face masks following the return of thick smog. File photo: EPA

Heavy smog’s return in northern China masks all-too-fleeting memories of Beijing’s blue skies

Air quality in the capital described as 'heavily polluted' on Thursday with the hazardous levels of smog expected to remain across the region for several days

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People in Beijing and many other cities in northern China are back wearing face masks following the return of thick smog. File photo: EPA
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