There are many conflicting studies out there but in summary there was a study that took particles from inside a room of patients and out of the 22, 6 had corona virus positive airbounre particles.
No need to take the risk and better not chance this. Even if the particles are droplet size, droplets can be 5 micrometres in diameter, these "droplets" can be carried with wind 27 feet.
There is no clear indication of how much virus does it take to infect a host.
In summary, every one should be wearing a n95 certified mask.
Lewis, Dyani. “Is the coronavirus airborne? Experts can’t agree.” Nature, 14 Mar. 2020, https://www.nature.com/articles/d41586-020-00974-w.