PATTERN AND CAUSE OF ACIDIC DEPOSITION IN THE CHONGQING REGION, SICHUAN-PROVINCE, CHINA

The Chongqing region located in Sichuan Province of China, comprises a large city, many small towns and rural areas. The region relies heavi ly on high-sulfur coal for energy production. Atmospheric pollution by sulfur oxides and other compounds from coal burning has become a majo r issue. Acid rain is observed throughout the region; volume weighted average pH is about 4.30. Average total S deposition for the region is estimated to be about 8 g S m-2 yr-1. In this paper we report concent rations of major ions in rain, fog, dew and clouds, of SO2 in air and of airborne particles as well as dustfall. The emissions and interacti ons between important chemical species in air and water droplets are d iscussed.