Not sure I should say this but I have an old Racal Airlite respirator, (no longer made), a Sundstrom half face mask and loads of disposable masks. Do I wear them? mostly no by the time I've thought about putting one on I've done the cutting it's only if I've a big job to do that I even think about putting one on. I also have a vacuum I can connect to the saw to collect the dust, do I switch it on? Again no. I also have ear protectors again they're left hanging up when scrollsawing.
Brenda, if your glasses steam up with masks then the best solution is an air fed visor like the Airlite, there are several cheaper brands of this type of mask, or try something like the Sundstrom, it doesn't steam up my glasses like disposable ones do (when I wear it). You could also try ear plugs instead of muffs.