"The study’s findings are also in line with previous research: A 2021 study suggested that PM2.5 from wildfires is up to 10 times more harmful than PM2.5 from other sources, such as ambient pollution."
Stroke risk doesn't seem to change much whether people are exposed to 1, 2 or 3 years of non-smoke PM2.5 pollution.
“But for smoke, this picture is very different,” said Yang Liu. "The longer you’re exposed to smoke, the greater your stroke risk.”
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Wildfire Smoke Linked to 17,000 Strokes Annually in the United States - Eos
A study of 25 million Medicare participants adds to a body of evidence suggesting that prolonged exposure to wildfire smoke is more harmful to human health than other forms of air pollution.