I bought some “buff” style stretch neck tubes. I wear them like a dickee (remember them?) and pull them up when I’m near enough to annoy others. They are comfortable, breathable, and cheap. I am not under the illusion that they do anything. It just makes others feel better. Remember, every old lady is convinced she will die if anyone breaths near her. They are literally in terror and they need to shop for food too.
My favorite one has a silk screened bag of flamin’ hot Cheetos on it. They double as a face and neck covering while mowing or fishing near swarms of gnats.