There are three main sources of SO2.They are separatly from sulphuric acid production,nonferous metallurgy and coal-fired kilns and boilers.

• 我国主要的SO2污染源可归纳为三个方面：硫酸厂排放的SO2，有色金属冶炼过程排放的SO2和燃煤窑炉排放的SO2。