Los Angeles: Exposure to air pollutants, in particular fine particles (PM2.5) and nitrogen dioxide (NO2), increased the risk of hospitalisation in COVID-19 patients by up to 30 percent, even for the fully vaccinated, according to a study.
A team, including researchers from University of Southern California (USC), US, analysed medical records from patients at Kaiser Permanente Southern California‘s (KPSC) Department of Research & Evaluation.
Across the health care network, 50,010 patients, aged 12 and above, were diagnosed with COVID-19 in July or August of 2021, when the Delta variant of SARS-CoV-2 was circulating and many people had been vaccinated.
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