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Coal use in rural areas in the heating season is a major source of air pollution in the winter, said Sun.

Companies in upstream production search for oil deposits and extract them. Downstream companies are closer to the consumer and are involved in refining and marketing.

Communism was called a haunting ghost more than a century and a half ago, and few believed the Communist Party of China would survive when it was founded in 1921.

Compared with the boom in online business, China's largest second-hand car market, the Huaxiang market in southern Beijing, which has a cluster of over 600 shops, is seeing less shoppers.

Coal prices in China have surged since last year, as a result of the government's effort to curb industrial overcapacity. Premier Li Keqiang said in the Government Work Report that China will reduce coal production by at least 150 million tons this year.