Air pollution threatens public health. Now, research also links it to worse outcomes of COVID-19, including hospitalization and death.
published May 24 in the, researchers looked at data from about 151,000 Canadians who tested positive for COVID-19 in Ontario and calculated their exposure to air pollution by looking at their addresses for the five years before the pandemic and assessing the air pollution in that area. It’s an imperfect metric, the study authors acknowledge; individuals’ pollutant exposure differs even within the same region, since people’s activities and travel vary.
However, these pollutants are likely not the only ones that can influence disease outcomes, the authors noted. Air pollution is a mix of hundreds of interacting gasses and particles, many of which are thought to affect people’s cardiovascular and pulmonary systems. The study was observational and therefore unable to establish a cause-and-effect relationship. But air pollution could make people more vulnerable to COVID-19 in a number of ways, the researchers hypothesize. For instance, air pollution might increase people’s viral loads by limiting the lungs’ immune responses and anti-microbial activities, the study authors say.
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