Avoiding exposure to air pollution is not only crucial for lung health but also for brain health, as highlighted by a McMaster University professor. Russell de Souza and his team discovered that increased long-term exposure to two common air pollutants was linked to minor differences in brain function. The study, published in the journal “Stroke,” examined the impact of air pollution on the cognitive performance of approximately 7,000 Canadians.

Participants, with an average age of 57 from various Canadian regions, were evaluated for their exposure to air pollution over a five-year period. The study focused on fine particulate matter, commonly found in sources like wildfire smoke and vehicle emissions, and nitrogen dioxide, a gas present in vehicle exhaust. Cognitive health was assessed using tests that measured memory and cognitive processing efficiency.

According to de Souza, exposure to these air pollutants led to lower scores on cognitive tests, although the declines were not severe enough to be immediately noticeable. The professor emphasized the importance of early detection to prevent further cognitive decline. While Canada has made significant progress in reducing air pollution, factors like climate-related wildfires have partially offset these gains.

De Souza advised that areas near airports, highways, and freight yards tend to have higher air pollution levels and recommended checking daily air quality advisories for local risk assessment. Health Canada suggested indoor measures to reduce exposure to fine particulate matter and nitrogen dioxide, emphasizing the health risks associated with these pollutants, especially for individuals with respiratory conditions.

The research conducted by de Souza’s team was part of the Canadian Alliance for Healthy Hearts and Minds study, supported by various organizations. Long-term studies are necessary to comprehend the impact of ongoing air pollution exposure on cognitive decline and to explore how improving air quality could safeguard brain health.