Air quality alerts issued for region

Updated 2017-10-27 09:33:14 China Daily

Yellow warnings trigger measures to cut emissions; wind on Saturday will help

Beijing and Tianjin issued yellow alerts for smog on Thursday afternoon, requiring polluting companies to suspend production to lower emissions. The smog is forecast to linger until around noon on Saturday, the national environmental monitoring authority said.

Shijiazhuang in Hebei province saw pollution rise to the most severe level, and many other cities-including Baoding in Hebei province, Beijing and Tianjin-reached their second-worst pollution mark by 4 pm, according to the China National Environmental Monitoring Center. The air quality index in Beijing, for example, hit 235.

"The lasting air pollution will cover a wide swath of the northern and eastern regions, and will peak on Friday," the center said on Thursday, adding that many cities will see severe pollution on Friday, including Beijing and Tianjin; Hebei's Shijiazhuang, Tangshan, Baoding and Langfang; and Shandong province's Dezhou and Liaocheng.

A cold front will bring wind on Saturday morning, and smog will ease gradually from north to south, clearing the skies in Beijing. However, some cities downwind may see pollution worsen on Saturday, the center said.

The current spell of air pollution, which is forecast to persist until Saturday, is mainly the result of heavy emissions from local companies combined with unfavorable weather conditions that prevent dispersal, said Wang Shuxiao, professor of environmental studies at Tsinghua University.

In response, Beijing and Tianjin issued yellow alerts, the third-highest in the nation's four-tier emergency response system-red (the highest), orange, yellow and blue-on Thursday.

Under a yellow alert, construction sites are required to stop all activities that generate dust, and some polluting companies-such as furniture plants, foundries and glass factories-must suspend production.

Tianjin has toughened its restrictions on industrial production while alerts are in effect. For example, under a yellow alert, total industrial emissions will be reduced by 30 percent to clear the air pollution, with production halted at all foundries.

The severe air pollution typically seen in autumn and winter in northern regions has become a thorny issue, and the Ministry of Environmental Protection has launched a campaign with other ministries and provincial governments to reduce the number of days with severe air pollution by 15 percent from October to March.

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