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- W4221021625 abstract "Background Ambient air pollution is thought to contribute to increased risk of COVID-19, but the evidence is controversial. Objective To evaluate the associations between short-term variations in outdoor concentrations of ambient air pollution and COVID-19 emergency department (ED) visits. Methods We conducted a case-crossover study of 78 255 COVID-19 ED visits in Alberta and Ontario, Canada between 1 March 2020 and 31 March 2021. Daily air pollution data (ie, fine particulate matter with diameter less than 2.5 µm (PM 2.5 ), nitrogen dioxide (NO 2 ) and ozone were assigned to individual case of COVID-19 in 10 km × 10 km grid resolution. Conditional logistic regression was used to estimate associations between air pollution and ED visits for COVID-19. Results Cumulative ambient exposure over 0–3 days to PM2.5 (OR 1.010; 95% CI 1.004 to 1.015, per 6.2 µg/m 3 ) and NO 2 (OR 1.021; 95% CI 1.015 to 1.028, per 7.7 ppb) concentrations were associated with ED visits for COVID-19. We found that the association between PM 2.5 and COVID-19 ED visits was stronger among those hospitalised following an ED visit, as a measure of disease severity, (OR 1.023; 95% CI 1.015 to 1.031) compared with those not hospitalised (OR 0.992; 95% CI 0.980 to 1.004) (p value for effect modification=0.04). Conclusions We found associations between short-term exposure to ambient air pollutants and COVID-19 ED visits. Exposure to air pollution may also lead to more severe COVID-19 disease." @default.
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- W4221021625 date "2022-03-31" @default.
- W4221021625 modified "2023-10-18" @default.
- W4221021625 title "Short-term exposure to ambient air pollution and individual emergency department visits for COVID-19: a case-crossover study in Canada" @default.
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- W4221021625 doi "https://doi.org/10.1136/thoraxjnl-2021-217602" @default.
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