Using clean-coal technologies to repower existing factories promises ultimately a substantial reduction of polluting emissions, and will affect the full range of pollutants implicated in acid rain  The strategy of using these technologies could cut sulfur dioxide emissions by more than 80 percent and nitrogen oxide emissions by more than 50 percent
The emission of a smaller quantity of nitrogen pollutants would in turn reduce the formation of noxious ozone in the troposphere
Sulfur dioxide emissions are the most dangerous pollutants implicated in acid rain.