SO2 Pollution in Double-Control Zones In the 341 cities of the statistics (including county level municipality),64 of them are located in SO2 Pollution Control Zone and 118 belong to Acid Rain Control Zone.

• “两控区”二氧化硫污染情况 统计的341个城市中(包括县级市)，有64个城市属于二氧化硫污染控制区，118个城市属于酸雨控制区。