Coal output in China, the world's largest coal producer, continued to decline in the first 10 months of 2015, as the impact of clean air and renewable energy policies began to weigh on the industry, official data showed on Tuesday.

China's coal production fell 3.6 percent year-on-year to 3.05 billion tons in the first 10 months, and the country imported 170 million tons of coal, dropping 29.9 percent year-on-year, according to figures from the National Development and Reform Commission, the country's top economic planner.