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The authors stated in the Discussion that "In addition, physical distancing and other public health interventions were introduced nationwide in England during the first epidemic, mitigating any distortion between air-pollution and COVID-19 mortality due to potential regional level differences." Moreover, the public health message from this study, and others like it, is that outdoor air pollution increases mortality rates of COVID-19 thereby suggesting to some that going outdoors will increase infections. As we indicated in our review ([17]), bias from this under ascertainment can be appreciable and will likely vary by socioeconomic status of regions and the capacity of each area to test and treat COVID-19 that will covary with concentrations of air pollution ([7]). Many of the following comments are generic to most studies of COVID-19 and air pollution which we have discussed at length in our methodological paper in Environmental Health Perspectives ([17]) as well as in another critique of a recent paper ([8]). [Extracted from the article]