I am a physician. I wholeheartedly agree with the recommendation of wearing an N95 mask when doing anything that will stir up dust in the coop. There are very severe chronic lung diseases that can be prevented. However, right now hospitals have a huge shortage of these masks needed to protect the doctors, nurses, therapists and assistants who are caring for patients with Covid-19, and they continue to put themselves at risk in order to care for their patients even without this much needed equipment.
If you do have an extra supply of clean N95 masks, even just a few, consider contacting your local hospital to see if they need donations to help keep your local community as healthy as possible. I know in other countries they have resorted to makeshift masks using paper or cloth stapled to rubber bands--barely even helpful from this airborne virus... Each mask is valuable and appreciated right now!