I’m the senior author of the JID review on outdoor transmission of SARS-CoV-2 and other respiratory viruses, and I’d like to clarify a reported number. @MonicaGandhi9 @DLeonhardt
academic.oup.com/jid/article/22…
academic.oup.com/jid/article/22…
The first sentence of our abstract states that a low proportion of reported global transmissions occur outdoors. Our review did not allow for us to quantify the amount of SARS-CoV-2 transmission occurring outdoors, nor did we state that 10% of transmissions occur outdoors.
In the review we summarized findings from 5 studies on SARS-CoV-2, which showed low outdoor transmission of SARS-CoV-2 – all at very low percent. 
These studies included Qian et al (<<1% outdoor transmission, or 2/7324 cases outdoors) pubmed.ncbi.nlm.nih.gov/33131151/
Leclerc et al 2020 (<<1% transmissions or 95/10926 cases linked to construction sites when we accessed database)ncbi.nlm.nih.gov/pmc/articles/P…
Nishiura et al 2020 (odds of indoor transmission 18X higher than outdoors, no raw data available) medrxiv.org/content/10.110…
Lan et al 2020 (4/103 cases linked to construction sites, which may be outdoors; 5% of work-related cases) and Szablewski 2020 which described an oubreak of SARS-CV-2 during a summer camp.
Our paper states clearly that the definition of outdoors was not uniform in the papers we chose and that transmissions in construction sites and in camp settings may be related to indoor time and not outdoor time. Here is a table with more details.
Clearly, more research is needed to understand the risk outdoors versus indoors – but our review suggests it is low (much lower than 10%).
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