Regular exercise is linked to living longer, even in cities where air pollution is high, a study suggests.
The research, which tracked nearly 400,000 adults in Taiwan over 15 years, confirmed that higher long-term exposure to a type of pollution known as PM2.5s was linked to shorter lifespans.
PM2.5s are particles that come mainly from motor traffic — diesel exhausts and brake pads — and wood-burning. They are less than 2.5 micrometres wide. By comparison an average human hair is 90 micrometres in diameter.
The analysis found that people who lived in cities where the air was dirtiest and who regularly exercised had a lower risk of dying during the 15 years that they were tracked by the study.
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