Beijing's air quality worsens, but no red alert
December 30, 2015  01:50
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Parts of China's capital Beijing suffered air pollution more than 20 times recommended levels, but authorities refrained from issuing the highest smog alert.

Counts of PM2.5 -- harmful microscopic particles that penetrate deep into the lungs -- reached 529, according to the United States embassy, which issues independent readings.

The World Health Organisation's recommended maximum exposure is 25 over a 24-hour period.

China's state weather observatory issued a yellow alert -- the second highest in a four-tier warning system -- for smog in Beijing and other parts of north China, the official Xinhua news agency said.

The pollution will linger until tomorrow, it added.
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