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Higher air pollution linked to more severe cases of COVID-19, study suggests

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People living in areas with higher levels of air pollution are more likely to develop severe COVID-19 illness that leads to hospitalization and even death, a new study suggests.

The research, published Tuesday in the Canadian Medical Association Journal (CMAJ), found an elevated likelihood of hospitalization, admission to an intensive care unit and death among COVID-19 cases who were chronically exposed to fine particulate matter, nitrogen dioxide and ground-level ozone. “These results suggest that chronic exposure to air pollution before SARS-CoV-2 infection may contribute to COVID-19 severity, particularly chronic exposure to (ozone),” the researchers write. Read more: 86% of Canadians live in areas where air pollution exceeds WHO guidelines: researchers The study was conducted by researchers affiliated with Health Canada, which also provided funding.

Researchers identified all COVID-19 cases confirmed in Ontario during 2020 and subtracted long-term care residents and anyone under 20 years of age, leaving them with just over 151,000 cases.

Long-term care residents were excluded due to frailty and differences in air pollution exposure compared to the general population.

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