China has warned residents across a large part of its north to prepare for a wave of choking smog arriving over the weekend, the worst of which is expected over Beijing, prompting the capital to issue its second "red alert".
The National Meteorological Centre said the smog would stretch from Xian, home to the world-famous Terracotta Warriors, across part of central China, through Beijing and up into Shenyang and Harbin in China's frigid northeast.
The air pollution would begin rolling in from about Saturday evening and last until Tuesday, with visibility in the worst affected areas such as Beijing likely to fall to less than 1km, it said.
The pollution index would probably exceed 500 in Beijing and parts of Hebei province, which surrounds the capital, it said. Residents are encouraged to remain indoors at levels higher than 300, according to government guidelines.
The Beijing city government issued its first "red alert" last week following criticism that previous bouts of smog had failed to trigger the highest warning level.
Beijing's second red alert comes after a landmark climate agreement was reached in Paris earlier this month, setting a course away from a fossil fuel-driven economy within decades in a bid to arrest global warming.
A red alert is triggered when the government believes air quality will surpass a level of 200 on an air quality index that measures various pollutants for at least three days. The US government deems a level of more than 200 "very unhealthy".
In Beijing, a red alert means around half the vehicles are removed from the roads with an odd-even licence plate system enforced. Schools are recommended to close and outdoor construction is banned.
"I'm very concerned about the pollution, I think the government needs to put more effort into solving this," said Cheng Xianke, a 34-year-old Beijing software developer.
The Beijing environment bureau said the red alert would last from 7am on Saturday to midnight on Tuesday. The official Xinhua news agency said the smog would be worse than last week.
Beijing's neighbouring city of Tianjin also aims to remove about half of all cars from the road in the event of a red alert.
Hebei's environment protection bureau said it was issuing an orange alert, the second-highest, starting from Friday. Schools will not close and there will be no vehicle restrictions but it recommends no outdoor activities and that people use public transport.
Shenyang said it was issuing a yellow alert, the third-highest level.
After decades of unbridled economic growth, China's leadership has vowed to crack down on severe levels of air, water and soil pollution, including the heavy smog that often blankets major cities.
City residents have previously criticised authorities for being too slow to issue red alerts for heavy smog.
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