Local health professionals in Rouyn-Noranda are urging the incoming Quebec administration to uphold the 2029 arsenic emissions ceiling for the Horne Smelter. The experts stress that maintaining the limit of 15 nanograms per cubic metre of arsenic is essential for protecting public health in the region.
The Horne Smelter, a major industrial facility in the area, was previously granted a deferral by the former Quebec government to meet the emissions target. That postponement allowed the plant additional time to adjust its processes before the 2029 deadline. Health officials now ask the new government to retain the original schedule rather than extending the deadline further.
The 15 ng/m³ threshold represents the level set by provincial regulators for arsenic released into the atmosphere. Arsenic is recognized as a toxic element with known health risks, and limiting its concentration in ambient air is a core component of the province’s environmental and public‑health strategy.
By keeping the 2029 target, the province would ensure that the smelter’s emissions are reduced in line with scientific recommendations. The health experts involved in the appeal have not provided new data, but they reference the established limit as a benchmark for safe air quality.
The request comes as the new Quebec government prepares its environmental agenda. Officials from the upcoming administration have not yet responded publicly to the health community’s call. The outcome will determine whether the Horne Smelter meets the 2029 arsenic standard or seeks another extension, a decision that could affect air quality for residents of Rouyn‑Noranda and surrounding communities.