China will ban sales and imports of coal with high ash or sulfur in a move to promote cleaner types of the fuel and improve the nation’s air quality. Coal with ash content of more than 40 percent and sulfur of more than 3 percent is banned from sales and imports into China starting Jan. 1, according to a regulation posted on the website of the National Development and Reform Commission yesterday. Lignite containing ash of more than 30 percent and sulfur of more than 1.5 percent is also prohibited. Other limitations involve coal with chemical content such as mercury and arsenic. China, the world’s largest consumer of coal, is restricting the dirtiest grades to fight pollution. It will encourage imports of higher-quality supplies after smog worsened in Shanghai and Beijing and sparked social unrest in Maoming and Hangzhou. The nation depends on coal for about 65 percent of […]