Avoiding air pollution not only safeguards your lungs but also shields your brain, as per a McMaster University expert. Russell de Souza, a professor in the university’s Department of Health Research Methods, revealed that prolonged exposure to two common air pollutants correlates with slight alterations in brain health. The study, coauthored by de Souza and published in the journal Stroke on May 13, examined approximately 7,000 Canadians’ brain health performance concerning exposure to prevalent air pollutants.
The participants, with an average age of 57 from British Columbia, Alberta, Ontario, Quebec, and Nova Scotia, were tested between 2014 and 2018 for their exposure to air pollution in the preceding five years. The pollutants under scrutiny were fine particulate matter, often present in wildfire smoke, industrial emissions, and vehicle exhaust, alongside nitrogen dioxide, a gas found in vehicle emissions.
Utilizing the Montréal Cognitive Assessment and the Digit Symbol Substitution Test, researchers evaluated brain health by assessing memory retention and cognitive processing efficiency. De Souza emphasized that these tests illuminate the brain’s functionality and efficiency.
The study indicated that exposure to both air pollutants led to lower scores on the cognitive tests, although the declines were not drastic enough to cause immediate noticeable effects. De Souza highlighted the importance of recognizing these early declines to prevent further deterioration.
While Canada boasts relatively clean air, recent climate-induced wildfires have slightly compromised this achievement, according to de Souza. He advised individuals to monitor daily air quality advisories, especially in proximity to airports, highways, and freight yards, to gauge local air pollution risks.
Health Canada recommends strategies to minimize indoor exposure to fine particulate matter and nitrogen dioxide, including proper ventilation and avoidance of idling cars in enclosed spaces. Exposure to these pollutants can exacerbate breathing issues, particularly for vulnerable individuals.
The research conducted by de Souza’s team under the Canadian Alliance for Healthy Hearts and Minds stresses the necessity of long-term studies to comprehend the impact of continual air pollution exposure on cognitive decline and the potential protective effects of improved air quality on brain health.