Coal-fired power plants in Pennsylvania cut smog-forming emissions by more than half last year, in a rare regulatory effort that has won support from both industry officials and environmentalists. Emissions of nitrogen oxides, or NOx, at the state’s six power plants that burn newly mined coal exclusively fell 60% last year from the year earlier to 23,133 tons.

Source: Wall Street Journal March 21, 2018 12:01 UTC