The older technology Söderberg potlines at the Baie-Comeau Smelter were retired in 2013. As a result, Alcoa’s PAH emissions in Québec decreased by 90% overall and by 99% in Baie-Comeau. PAH data is not published here due to the low emission rate.
Despite the closure of the Söderberg potlines, monitoring of benzo(a)pyrene (BaP) levels in the City of Baie-Comeau continued in 2015. BaP, a member of the PAH family which is used as an environmental indicator, is measured at three sampling stations located on Bienville Avenue, Bouchette Street and Denonville Street.
A significant decrease in PAH has been observed at all stations since the closure of the Söderberg potlines in September 2013.