With the mask check the life of the filters. I've got a nice little mask. It's rated for everything you could think of. BUT and it's a big BUT the life of the filters is only eight hours. [I think have to check the paperwork]. Now you say that doesn't sound too bad but it's eight hours after you open the package. So if you open the package to look at the things they start working. I put mine into a double ziplock bag when not in use. That supposedly keeps them going longer.
I actually think the mask I got is over kill. It likely would have been better to go with the cheaper model.