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BEIJING — The boy’s chronic cough and stuffy nose began last year at the age of 3. His symptoms worsened this winter, when smog across northern China surged to record levels. Now he needs his sinuses cleared every night with saltwater piped through a machine’s tubes.The boy’s mother, Zhang Zixuan, said she almost never lets him go outside, and when she does she usually makes him wear a face mask. The difference between Britain, where she once studied, and China is “heaven and hell,” she said.Levels of deadly pollutants up to 40 times the recommended exposure limit in Beijing and other cities have struck fear into parents and led them to take steps that are radically altering the nature of urban life for their children.Parents are confining sons and daughters to their homes, even if it means keeping them away from friends. Schools are canceling outdoor activities and field trips. Parents with means are choosing schools based on air-filtration systems, and some international schools have built gigantic, futuristic-looking domes over sports fields to ensure healthy breathing.“I hope in the future we’ll move to a foreign country,” Ms. Zhang, a lawyer, said as her ailing son, Wu Xiaotian, played on a mat in their apartment, near a new air purifier. “Otherwise we’ll choke to death.”She is not alone in looking to leave. Some middle- and upper-class Chinese parents and expatriates have already begun leaving China, a trend that executives say could result in a huge loss of talent and experience. Foreign parents are also turning down prestigious jobs or negotiating for hardship pay from their employers, citing the pollution.There are no statistics for the flight, and many people are still eager to come work in Beijing, but talk of leaving is gaining urgency around the capital and on Chinese microblogs and parenting forums. Chinese are also discussing holidays to what they call the “clean-air destinations” of Tibet, Hainan and Fujian.Read the full text article at The New York Time, Asia PacificRelated Air Pollution Linked to 1.2 Million Premature Deaths in China (April 2, 2013)Cost of Environmental Damage in China Growing Rapidly Amid Industrialization (March 30, 2013)As Pollution Worsens in China, Solutions Succumb to Infighting (March 22, 2013)