N95 respirators, like Phil notes, is a good thing to carry in the truck. They can come in handy in a number of situations. We've always had respirators around the house. I really can't remember a time when we didn't. My dad did a lot of woodworking, so that's probably why.
Any N95 filter will work, but there are actually nine different types of disposable respirator masks available, with three basic subcategories. The "N" in N95 mean not resistant to oil. There is also the "R", as in R95, that is
somewhat resistant to oil, Oil-
Resistant, and then the "P", as in P95, which is
strongly resistant to oil, Oil-
Proof. Beyond that are the numbers of 95, 99 and 100, where 95 filters out
at least 95% of airborne particles, 99 filters out
at least 99% of airborne particles, and 100 filters out
at least 99.7% of airborne particles (excluding asbestos - you want a specific asbestos filter for that or a HE cannister filter). Here's a detailed table of what's what and why and other stuff:
Respirator Classifications
I prefer the
3M™ brand Maintenance-Free Particulate Respirators for a number of reasons, partly because they are easier to get than the NanoMasks (the link above goes to the child's mask), and they have different respirators for different needs and contaminants that are also relatively easy to get if you need them. All of the 3M™ filters have electrostatically charged fibers to trap particles.
For general short term use, the
3M™ Particulate Respirator 8210, N95 filter is fine and easy to get. For all dusty conditions, like sanding, sweeping, driving through a dust storm or the smoke of a fire. Comes in a 20-pack and is available
at Lowe's $19.95 and at
Amazon for $12.55. At Lowe's it may come packaged as Drywall or sanding respirator or something else, but it's the 8210 model number that matters, as they're all the same filter. The 8210DW is the drywall package and the 8210Plus version has braided straps and a non-staple attachment, for example.
For longer term wear, like more than half an hour, especially in heat and humidity, the
3M™ Particulate Respirator 8511, N95 filter is the one to get. It costs twice as much, but worth every penny because it has a one-way relief valve that lets out heat and moisture and it won't fog up protective eye wear. At
Amazon it's $15.19 for a 10-pack, and at
Lowe's it's $19.95 for the same 10-Pack. It's an excellent all-purpose mask, and is what I have in the truck.
For stuff with oil in them, like paints, pesticides, any Pxx respirator will work, as it will be oil-Proof, but for that and things with heavy odors, like paints, aerosol glues, bleach, stockyards, many truck stops and baby diapers, I have used, and really like, the
3M™ Particulate Respirator 8577, P95, with Nuisance Level Organic Vapor Relief Valve. This one's about $32 for a box of 10, but worth it if you need it. It's gnarly. I used a bunch of ScotchGuard in the van, doors closed and not vented, and it nearly did me in. Got all kinds of sick. Next time I did anything in the van (more ScotchGuard and some painting) I used one of these respirators and didn't smell a thing (other than my own breath at 10 times normal strength, so I learned to give the inside of the respirator a shot of breath spray before beginning). The 8577 is for organic gases and other general smelly things, but if you're ever dealing specifically with acid gases, like doing some glass etching, you'd want the
3M™ Particulate Respirator 8576, P95, with Nuisance Level Acid Gas Relief Valve.
So for quick and dirty short term wear, the 8210 works great and is easy to find at most hardware stores, but if you're going to be wearing for any extended period of time, the 8511 is the one to get. Beynd that it just depends on the applications. All of these filters will protect against viruses and things, including TB.