Pollution comes mainly from paper mills, tanneries, electroplating, printing and dyeing, cement, brick making, coal, nonferrous metal, non-metal and ferrous metal, and mineral mining.

• 中小企业污染源分散，结构性污染突出，主要集中在技术水平低、污染治理难的造纸、制革、电镀、印染、水泥、制砖、煤炭、有色金属、非金属和黑色金属矿物采矿业等行业。