Driven by wildfires, 6th World Air Quality report finds Canada’s pollution worse than U.S.
Canada’s air pollution levels last year were worse than those in the United States for the first time since an air-quality firm started publishing its assessments in 2018.
“Air pollution is a silent killer,” said Dr. Samantha Green, a family physician with Unity Health Toronto and associate professor at the University of Toronto who was not involved with the report. The U.S. typically dominates the World Air Quality report’s list of 15 most polluted cities in both the U.S. and Canada, with Canadian cities appearing on the list just three times since the first assessment was published in 2018.
The report aggregates monitoring data from sources around the world, including governmental and non-profit, on pollution known as PM2.5, fine particulate matter so small it can travel deep into lungs and pose a risk to human health. The data is then reported in units of micrograms per cubic metre, and held up against World Health Organization guidelines to keep concentration levels below 5.
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