I wouldn't be surprised if all construction sites soon shut down. They're reporting that tiny airborne droplets of the virus can still survive for up to three hours. So in theory you could be working outside on a construction site, ten feet away from other construction workers, and still contract it if you're not wearing a mask.
I'd like to comment on this as a physician working the front lines of this pandemic. The study showing that aerosolized COVID-19 can be viable for up to 3 hours, although decreasing in viability exponentially, was done from a lab created aerosol. The purpose of this was to illustrate that medical procedures that can aerosolize patient infected fluids need to be done in a negative pressure rooms with all medical personnel in the procedure room fully equipped with protective equipment. This is an artificial situation, there is no evidence that someone infected with COVID-19 will aerosolize COVID-19. The current evidence is that infected persons will infect others through droplets when coughing/sneezing, direct contact with others and when other people come into contact with the surfaces that an infected person touched with contaminated fluids. Droplets do not have the same dynamics as aerosols.
Furthermore, The NEJM study showed COVID-19 was still viable 72 hours after it was applied to plastic and stainless steel, although the volume of virus decreased exponentially over time. On copper, there was no viable COVID-19 after 4 hours, on cardboard there was no viable SRS-CoV-2 virus after 24 hours. Thus the kind of guidance that we’re giving about washing hands and wiping surfaces is likely to be very good advice.
Wash your hands thoroughly and frequently. Continue to practice social distancing, stay safe.
Sorry about the off topic comment.
addendum. COVID-19 aka SRS-CoV-2, sorry if any confusion, the acronyms are interchangeable.