Pollutants and nasty gases essentially crowd out oxygen in our atmosphere. And since oxygen is absolutely vital for everything from fueling our cells to just keeping us upright, you really have to wonder about the connection between dirty air and respiratory infections. It’s a question that keeps coming up.
With the flood of COVID-19 research coming in constantly, a recent study investigated the potential tie between poor air quality in the Northern US and the increased COVID-19 morbidity and mortality rates in the region. The researchers point to evidence showing that folks living in spots with heavy air pollution are naturally more susceptible to chronic respiratory issues and long-term inflammation—which we already knew. Based on that, they argue that air pollution in the Northern US should be considered an additional co-factor of the high COVID-19 mortality rate in the area, though they didn't actually provide specific data to prove that hypothesis.
There’s also another preprint out there—so it hasn't even gone through peer review yet—that looks at a similar connection across China, Italy, and the US. In this case, this study did actually analyze air pollutant data from these locations using information from ground monitoring stations and Sentinel-5 satellite data. While it's true that they control for population density in statistical analyses, they seem to overlook the possibility that the density itself, rather than the smog, might be driving the higher infection rates. They also don't really touch on the socio-economic factors that often overlap with poor air quality and lead to higher death rates. The researchers highlight how closely poor air quality aligns with SARS-CoV-2 spread and high mortality in places like Italy, but they totally skip over the fact that since that country has one of the oldest populations globally, they were already facing a much higher risk of mortality regardless of the air.
Additionally, a further study looking at cases taken from 66 administrative regions in Italy, Spain, France, and Germany also used satellite data to look for an association between NO2 levels and COVID-19 fatalities. But, honestly, it runs into many of the same hurdles mentioned earlier. Relying on data from broad administrative regions can be pretty tricky because there are huge, meaningful differences within those zones that can mess with the analysis.
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https://www.technologynetworks.com/t...otspots-334058