The Chinese capital has for many years suffered from serious air pollution. Primary sources of pollutants include exhaust emission from Beijing's more than five million motor vehicles, coal burning in neighbouring regions, dust storms from the north and local construction dust. Pollution is one aspect of the broader topic of environmental issues in China. Various forms of pollution have increased as China has industrialized, which has caused widespread environmental and health problems. the biggest health threat. Lung cancer and cardiovascular disease were increasing because of factory and vehicle air pollution and tobacco smoking. Lung cancer was two to three times more common in cities than in the countryside despite similar rates of tobacco smoking.
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