Beijing will ban coal use in its six main districts by the end of 2020, as the Chinese capital steps up efforts to combat air pollution, Reuters quoted the Beijing Municipal Environmental Protection Bureau as saying. Beijing and the surrounding area in China's northeast is often wreathed in noxious smog, which has been cited as a factor in high rates of lung cancer. Dongcheng, Xicheng, Chaoyang, Haidian, Fengtai and Shijingshan districts will all stop using coal and coal products and shut down coal-fired power plants and other coal facilities, the official Xinhua news agency said on Monday. In 2012, coal made up one-quarter of the city's total energy consumption, Xinhua quoted official statistics as saying. Fuel oil, petroleum coke, combustible waste and some biomass fuels will also be prohibited as part of the effort to fight pollution, Xinhua said.