BEIJING — When a thick quilt of smog enveloped swaths of China earlier this month, it set in motion a costly chain reaction for the world's No. 2 economy.
Authorities canceled flights across northern China and ordered some factories shut. Hospitals were flooded with hacking patients.
A fire in an empty furniture factory in eastern Zhejiang province went undetected for hours because the smoke was indistinguishable from the haze. In coastal Shandong province, most highways were closed for fear that low visibility would cause motorists to crash. And in Beijing, the local government urged residents to remain indoors and told construction sites to scale back activity.
Photos: Smog in China
"These are emergency measures that have the same economic impact as a strike or severe weather," said Louis Kuijs, a Hong Kong-based economist with the Royal Bank of Scotland and formerly of the World Bank. "They're very painful."
Residents in the capital have taken to mocking their famously filthy air and its attendant health hazards with the expression "Beijing cough." Meanwhile, Shanghai's Environmental Protection Bureau has introduced a cartoon mascot to communicate daily air quality on its website: a pig-tailed girl who bursts into tears when smog reaches hazardous levels.
But economists say China's smog is no joke. As air pollution continues to obscure China's cities, the cost to the nation in lost productivity and health problems is soaring. The World Bank estimates sickness and early death sapped China of $100 billion in 2009, or just under 3% of gross domestic product. China is now home to seven of the 10 most-polluted cities in the world, according to a report by the Asian Development Bank and Beijing's Tsinghua University.
A study by Greenpeace and Peking University's School of Public Health put the cost of healthcare to treat pollution-related ailments in Beijing, Shanghai, Guangzhou and Xian at more than $1 billion last year.
Beijing resident Zhang Jian takes his 2-year-old son to a doctor regularly to treat the toddler's chronic sinus infection.
"It's definitely related to the pollution," said Zhang, 35, who wore a disposable mask at an overcrowded children's hospital recently. "My son snores and his nose is blocked constantly. It's a problem because he's too young to clear his nose like adults."
The doctor's visit and treatment cost Zhang about $320 — nearly a week's pay for the IT professional.
The Beijing government says it's considering a host of emergency measures to clear the air. Among them: limiting vehicle usage, spraying building sites to reduce dust and restricting outdoor barbecue grills.
Even China's next premier, Li Keqiang, weighed in recently on the issue. "This is a problem accumulated over a long period of time, and solving the problem will also require a long time. But we need to take action."
China's smog crisis is not unlike those experienced in London and Los Angeles in the 1950s. Public outcry ultimately led to cleaner air and tougher environmental regulations.
Environmental activists hope the same happens in China. The official response in recent weeks has raised optimism that authorities will begin addressing pollution more openly.
Until recently, state media was loathe to use the word "pollution," opting instead for the euphemism "fog."
But popular pressure is building, making it harder for policymakers to ignore the foul air in many of China's largest cities.
After the staggeringly bad bout of air pollution in the middle of this month, micro-bloggers took to posting pictures of themselves online wearing masks.
Some held handwritten signs that read, "I don't want to be a human vacuum cleaner."
The phrase became the top-trending topic on the Twitter-like Sina Weibo, attracting several million hits.
China's smog taints economy, health
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China's smog taints economy, health
