The causal role of air pollutants in COVID-19 transmission remains speculative, given ecologic biases and uncontrolled confounding. Furthermore, the definitions of essential concepts related to the relationship between air pollution and coronavirus are highly ambiguous, including the concepts “air pollution as a factor for health risk” and “SARS-CoV-2 spreads by particulate air pollution”, and the constituents of ”virus-laden particles”, “droplet nuclei”, “virus-bearing aerosols produced from human atomization”, and ”particulate matter (air pollutants) with viruses attached” remain controversial. This ambiguity has resulted in considerable misunderstandings between researchers. Unfortunately, premature and unsubstantiated claims that SARS-CoV-2 coagulates (creates clusters) with outdoor particulate matter (PM10) in the air and that SARS-CoV-2 can be transported by air pollutants became widely circulated in the media and have been cited by some studies as fact. Although the presence of the markers of SARS-CoV-2 (viral fragments of coronavirus) in environmental samples is an important finding, the media and researchers should be cautious regarding the claim that SARS-CoV-2 can create clusters with outdoor PM10 in the air and spread via particulate air pollution, as this statement is currently only a hypothesis that lacks direct or indirect supporting evidence. The issue of coagulation of virus-laden particles (respiratory droplets and droplets nuclei) with ultrafine particles (PM0.1) may have more important consequences for mitigating or intensify virus inactivation in urban air and needs to be studied.
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