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Fresh air and sunlight could be important factors in combating the Coronavirus. Past studies have highlighted the phenomenon called the “open-air factor” (OAF), defined as the “germicidal constituent in outdoor air that reduces the survival and infectivity of pathogens”, which has been proven to reduce the survival and infectivity of harmful bacteria such as Escherichia coli, Staphylococcus epidermidis, group C streptococcus, and the influenza virus. In fact, open-air therapy was the standard treatment for infectious diseases before antibiotics were introduced. Sunlight levels also provide some protection against pathogens: A 2019 study showed that sunlight levels are inversely correlated with influenza transmission. Not only does spending time outside protect against viral transmission and reduce the survival of pathogenic microbes, but it also helps support the immune system. Sunlight is our main source of vitamin-D, a vitamin that plays a key role in optimizing our immunity. Additionally, a 2016 study found that…