In 2015, vent emissions of particulates increased slightly at the Baie-Comeau Smelter, notably due to repair work on its scrubbers leading to scrubber shutdowns. Particulate emissions at the Bécancour Smelter remained stable due to sustained efforts to improve process control. A series of gas treatment filters is refurbished each year. Emissions at the Deschambault Smelter are lower as it is equipped with double-capture technology. Improved control of carbon dust generation also contributed to reducing emissions in 2015.