The N-95’s were hard on my asthma but the chemicals would have been deadly. I can’t advise anybody to wear those to protect against covid unless they are in a hospital working directly with covid patients. IMO, they are overkill for a virus that most people survive. If not worn properly they can cause issues. We were required to take a break every so often to remove the mask and breathe fresh air.
There are different types of medical masks and some are better than others and worn for different things. Mine are the 4-ply hospital approved. No thin blue masks for us. My homemade cloth masks with filter pockets were more efficient than those.