Aerosol and Surface Stability of SARS-CoV-2 as Compared with SARS-CoV-1
nejm.org
nejm.org
Please note: aerosols do not sink to the floor, they just hover like dust in the air. Previously, aerosols were excluded as an infection vector. According to the article, transmission via aerosols is "plausible".
This means you should not share the same air for HOURS.
"The half-lives of SARS-CoV-2 and SARS-CoV-1 were similar in aerosols, with median estimates of approximately 1.1 to 1.2 hours and 95% credible intervals of 0.64 to 2.64 for SARS-CoV-2 and 0.78 to 2.43 for SARS-CoV-1 (Figure 1C, and Table S1 in the Supplementary Appendix)."