An aerial view of chimneys billowing out smoke and steam on December 17, 2016 in Changchun, China.

China's coal output fell 1.7 percent in the first two months of the year, even after Beijing urged miners to ramp up output to replenish supplies during the cold winter months, reversing tough measures to cut the country's reliance on fossil fuels.

Miners produced 506.78 million tonnes of coal in January and February, the National Bureau of Statistics said. That compares with 513.5 million tonnes in the first two months of 2016 and 546.5 million tonnes in 2015.