Gagnon, M. 1997. Regional Assessment: Southern Gaspé–Chaleur Bay. Priority Intervention Zone 20. Environment Canada – Quebec Region, Environmental Conservation, St. Lawrence Centre. 98 pages. In the early 1980s, several areas along the south shore of Chaleur Bay were heavily polluted by mercury and cadmium, and moderately polluted by arsenic, lead and zinc. The situation has since improved, however, thanks to efforts to control industrial effluent. Industrial activities in Belledune had been the source of cadmium, lead, arsenic and zinc contamination of sediment in the port and the coastal area downstream. Mercury contamination had been caused by effluent from a chlorine and caustic soda plant in Dalhousie, dredging of the port at Dalhousie, and the dumping of contaminated spoil in open water.Several large industrial plants are located on the south shore of Chaleur Bay: three pulp and paper mills (in Atholville, Dalhousie and Bathurst), three thermal power plants (two in Dalhousie and one in Belledune), a chlorine and caustic soda plant in Dalhousie and a lead smelter in Belledune. A chemical fertilizer plant in Belledune was recently shut down. These plants have been major sources of cadmium, lead, mercury and other toxic substances contaminating the south shore of Chaleur Bay.