Avoiding air pollution not only safeguards respiratory health but also has a positive impact on brain health, according to a recent study led by Russell de Souza, a McMaster University professor. The study, published in the journal “Stroke,” focused on the effects of long-term exposure to two common air pollutants on brain health among approximately 7,000 Canadians. Participants, with an average age of 57, were recruited from various provinces and their exposure to air pollution was assessed over a five-year period before the study.
The pollutants examined were fine particulate matter, commonly found in sources like wildfire smoke and vehicle emissions, and nitrogen dioxide, a gas present in vehicle exhaust. The researchers evaluated brain health using cognitive tests, including memory and symbol matching assessments.
Results indicated that exposure to these pollutants was linked to lower scores on the cognitive tests, suggesting measurable declines in brain function. While these declines may not be immediately noticeable or severe, de Souza emphasized the importance of identifying and addressing them early to prevent further deterioration.
Despite Canada’s overall success in maintaining clean air quality, de Souza highlighted the impact of climate-driven wildfires on air pollution levels in recent years. He advised individuals to monitor local air quality advisories, especially in areas near airports, highways, and industrial zones. Health Canada recommends indoor measures to reduce exposure to fine particulate matter and nitrogen dioxide, such as proper cleaning, ventilation, and gas appliance usage.
The study, conducted as part of the Canadian Alliance for Healthy Hearts and Minds, emphasized the need for further research to understand the long-term effects of air pollution on cognitive decline and the potential benefits of improving air quality for brain health.