It's (almost certainly) airborne - 239 scientists
https://academic.oup.com/cid/article/do ... 39/5867798We appeal to the medical community and to the relevant national and international bodies to recognize the potential for airborne spread of COVID-19. There is significant potential for inhalation exposure to viruses in microscopic respiratory droplets (microdroplets) at short to medium distances (up to several meters, or room scale), and we are advocating for the use of preventive measures to mitigate this route of airborne transmission.
Studies by the signatories and other scientists have demonstrated beyond any reasonable doubt that viruses are released during exhalation, talking, and coughing in microdroplets small enough to remain aloft in air and pose a risk of exposure at distances beyond 1 to 2 m from an infected individual (see e.g. [1-4]). For example, at typical indoor air velocities , a 5 μm droplet will travel tens of meters, much greater than the scale of a typical room, while settling from a height of 1.5 m to the floor. Several retrospective studies conducted after the SARS-CoV-1 epidemic demonstrated that airborne transmission was the most likely mechanism explaining the spatial pattern of infections e.g. . Retrospective analysis has shown the same for SARS-CoV-2 [7-10].
If you recall, the Hunan bus study in March 2020 was one of the first to show the ability of the virus to travel in a recirculated environment. Since then, the Korean call center and Chinese restaurant studies provide additional support of airborne transmission.
If you're in an enclosed space like a car or office with no fresh air, make sure you avoid it or wear a (K)N95.