Besides the existing pollution control program for S02，regional emission caps(区域排放上限) for other certain chemicals will be established in the three key air polluting areas—the Yangtze River Delta，Pearl River Delta and the Beijing­Tianjin­Hebei region.Coal­consumption caps will also be tried out in some areas，according to the plan.

　　The plan is aimed at dealing with regional air pollution—such as acid rain and smog—which have become increasingly obvious in China in recent years and caused a severe threat to people’s health，Zhang Lijun，vice­minister of environmental protection，said in an interview on Monday.

　　The air quality in a city affects the regions nearby because pollutants can travel through the atmosphere，said Chai Fahe，vice­director of Chinese Research Academy of Environmental Sciences.

　　“So efforts to reduce air pollution in a single city，targeting a certain pollutant will not be enough，” Chai said.

　　Zhang said the country’s major industrial districts—the Yangtze River Delta，Pearl River Delta and the Beijing­Tianjin­Hebei region—have recorded more than 100 misty days annually in recent years.

　　These three regions，home to at least 200 million people，occupy only 6.3 percent of the country’s area but consume 40 percent of the country’s coal and produce half of its steel，according to official figures.

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