Greater exposure to PM2.5, nitrogen dioxide, and black carbon was found to be associated with a higher risk of admission to a hospital or an intensive care unit and death. A long history of exposure to air pollution is associated with a higher risk of developing severe disease, admission to a hos
was associated with a 6% increase in mortality.
One hypothesis is that exposure to air pollution increases the individual’s risk of developing chronic comorbidities associated with severe COVID-19, such as hypertension. Nonetheless, the study authors believe that more research is needed to gain a better understanding of the main biological pathways involved.The COVAIR-CAT cohort is based on data from the Catalan public health system covering primary care, emergency care and the discharge from hospital of patients with acute conditions. It also includes data from a SARS-CoV-2 surveillance system , which gathered information on PCR and rapid antigen test results in cohort participants in Catalonia.
The meteorological and air pollution data were obtained from the pertinent Catalan and Spanish monitoring networks. These data were cross-checked with the place of residence of the 4,660,502 people in the study cohort.“One of the strengths of our analysis is that the population is very well represented.
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