I have some disposable N95 masks made by 3M for construction workers. I bought them at a hardware store a year ago. They don’t look much like medical N95 masks, but I presume they must meet some kind of requirement. They do have OSHA labels.

They fit tightly and have a nose clip for sealing.

Do you know if these are as effective at keeping out viral particles as they’re supposed to be protecting workers from lead and asbestos?