Int. J. Environ. Res. Public Health, Volume 18, Issue 5 (March-1 2021) – 582 articles
Cover Story (view full-size image): This study aimed to evaluate the risk of COVID-19 due to health behaviors reflected by air pollution level during the early phase of the COVID-19 pandemic in 159 cities in China. The attack rates of COVID-19 during the first two weeks after major cities’ closure were assessed concerning air quality index (AQI) two weeks before the closure. When PM2.5 levels exceeded 150, the infection risk decreased (relative risk, RR = 0.635, 95% CI: 0.442 to 0.912 for level 4; RR = 0.529, 95% CI: 0.337 to 0.830 for level 5, respectively). RR for PM2.5 and NO2 was 0.990 (95% CI, 0.984 to 0.997) and 0.946 (95% CI, 0.911 to 0.982), respectively, per one level increase of AQI. AQI before the pandemic was assumed as a surrogate variable for a mask-wearing. This provides evidence for the importance of wearing a mask to prevent an outbreak in a population. View this paper.
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