Benzo(a)pyrene in the ambient air in Baie-Comeau is measured at three sampling stations. A fourth sampling station was installed in 2010 on Bienville Street in the Saint-Georges neighborhood. This new station was added to better assess the prevailing conditions in the area. We have noted that the concentrations recorded at this station are much lower than those observed at Station 1 on Bouchette Street, although the Bienville station is located closer to the smelter.
The results reported from these stations represent an average of approximately 25 annual samples, since values can vary according to prevailing winds on sampling days. The 2013 mean values are comparable to those recorded in 2012 but, when considering all values recorded, a net decrease can be observed since the shutdown of the Söderberg potlines, in September 2013.