SHANGHAI (AP) — Shanghai authorities ordered schoolchildren indoors and halted all construction Friday as China's financial hub suffered one of its worst bouts of air pollution, bringing visibility down to a few dozen meters, delaying flights and obscuring the city's spectacular skyline.


The financial district was shrouded in a yellow haze, and noticeably fewer people walked the city's streets. Vehicle traffic also was thinner, as authorities pulled 30 percent of government vehicles from the roads. They also banned fireworks and public sporting events.


"I feel like I'm living in clouds of smog," said Zheng Qiaoyun, a local resident who kept her 6-month-old son at home. "I have a headache, I'm coughing, and it's hard to breathe on my way to my office."


Shanghai's concentration of tiny, harmful PM 2.5 particles reached 602.5 micrograms per cubic meter Friday afternoon, an extremely hazardous level that was the highest since the city began recording such data last December. That compares with the World Health Organization's safety guideline of 25 micrograms.


The dirty air that has gripped Shanghai and its neighboring provinces for days is attributed to coal burning, car exhaust, factory pollution and weather patterns, and is a stark reminder that pollution is a serious challenge in China. Beijing, the capital, has seen extremely heavy smog several times over the past year. In the far northeastern city of Harbin, some monitoring sites reported PM 2.5 rates up to 1,000 micrograms per cubic meter in October, when the winter heating season kicked off.


As a coastal city, Shanghai usually has mild to modest air pollution, but recent weather patterns have left the city's air stagnant. On China's social media, netizens swapped jokes over the rivalry between Shanghai and Beijing, saying the financial hub was catching up with the capital in air pollution.


Alan Yu, a chef in Shanghai, satirized the air on his microblog as though he were sampling a new vintage of wine.


"Today, Shanghai air really has a layered taste. At first, it tastes slightly astringent with some smokiness. Upon full contact with your palate, the aftertaste has some earthy bitterness, and upon careful distinguishing you can even feel some dust-like particulate matter," Yu wrote.


The environmental group Greenpeace said slow-moving and low-hanging air masses had carried factory emissions from Jiangsu, Anhui and Shandong provinces to Shanghai. But it said the root problem lies with the excessive industrial emissions in the region, including Zhejiang province to the south.



"Both Jiangsu and Zhejiang should act as soon as possible to set goals to reduce their coal consumption so that the Yantze River Delta will again be green with fresh air," Huang Wei, a Greenpeace project manager, said in a statement.


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Tang reported from Beijing. Associated Press researcher Fu Ting in Beijing contributed to this report.




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  • A woman and a child wear the masks to protect them from air pollution in Shanghai, China, Friday, Dec. 6, 2013. (AP Photo/Eugene Hoshiko)




  • Tourist with protective masks visit the Bund in dense haze in Shanghai, China, Friday, Dec. 6, 2013. (AP Photo/Eugene Hoshiko)




  • A couple in protective masks walk under haze in Shanghai, China, Friday, Dec. 6, 2013. (AP Photo/Eugene Hoshiko)




  • A building under construction is covered with haze in Shanghai, China, Friday, Dec. 6, 2013. (AP Photo/Eugene Hoshiko)




  • Houses and buildings are covered with haze in Shanghai, China, Friday, Dec. 6, 2013. Shanghai authorities ordered schoolchildren indoors and halted all construction Friday as China's financial hub suffered one its worst bouts of air pollution, bringing visibility down to a few dozen meters and obscuring the city's spectacular skyline. (AP Photo/Eugene Hoshiko)




  • Airport ground crew work in thick smog on the tarmac of Hongqiao airport in Shanghai as severe pollution blankets the city on December 6, 2013. (PETER PARKS/AFP/Getty Images)




  • An aircraft is barely visible through thick smog on the tarmac of Hongqiao airport in Shanghai as severe pollution blankets the city on December 6, 2013. ( PETER PARKS/AFP/Getty Images)




  • Airport ground crew wear masks as they work in thick smog on the tarmac of Hongqiao airport in Shanghai as severe pollution blankets the city on December 6, 2013. (PETER PARKS/AFP/Getty Images)




  • A tourist with a protective mask takes her self portrait at the Bund covered with heavy haze in Shanghai, China, Friday, Dec. 6, 2013. (AP Photo/Eugene Hoshiko)




  • A woman rides covered with heavy haze in Shanghai, China, Friday, Dec. 6, 2013. (AP Photo/Eugene Hoshiko)




  • People use escalators with skyscrapers, covered with haze in the background, in Shanghai, China, Friday, Dec. 6, 2013. (AP Photo/Eugene Hoshiko)