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Smog returns to Beijing with pollution levels set to worsen by weekend
Air 'heavily polluted' as southerly winds bring contaminants from Hebei; no relief until Sunday
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Beijing will remain shrouded in smog until tomorrow, forecasters have warned.
Pollution returned to the capital yesterday, with the official air quality index reaching 212 at 6pm, a level deemed by the authorities to be "heavily polluted".
The United States embassy reading was even higher, at 220, slightly below the "very unhealthy" level in its index.
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It is the third time the capital has been hit by choking air pollution this month.
The index readings have twice soared past the 400 mark in October.
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Any measurement above 300 is considered "hazardous", meaning people should avoid all outdoor exercise.
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