Acid rain is caused by the release of the gases SO2 (sulphur dioxide) and NOX (nitrous oxides). The main sources of NOX emissions are vehicles and fuel combustion. Sulphur dioxide reacts with ...

China has decreased the release of sulfur dioxide by 1.86 million tons over the past two years as a result of its efforts to combat acid rain and sulfur dioxide control. A total of 98 cities in ...