From what we have seen from videos from China (spaying down inside offices, outside on the street, spraying just everywhere), I think this virus is spread just by touching an affected person’s body part, or by that person touching something and giving that thing to you.
But of course there is no hard data on this, because China wants to keep all of this secret.
See post 965 from a recent group of doctors:
12. Health Departments (CDPH and OCHD) state the Airborne Infection Isolation Room (AIIR) is the least important of all the suggested measures to reduce exposure. Contact and droplet isolation in a regular room is likely to be just as effective. One heavily affected hospital in San Jose area is placing all “undifferentiated pneumonia” patients not meeting criteria for COVID testing in contact+droplet isolation for 2-3 days while seeing how they respond to empiric treatment and awaiting additional results.