Exhaust fumes, factories, coal-burning and dust are the main sources of air pollution in most cities, accounting for 85 to 90 percent of the total pollutant source, said Wu Xiaoqing, the Chinese vice minister of Environmental Protection, at a national environmental monitoring conference on Wednesday.

Beijing on Monday released an updated emergency plan stating that if heavy smog persists for more than three days the city will launch top-level emergency efforts to reduce pollutants, including restricting the use of private vehicles.

bbabo.Net