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That's why you wear both pool goggles and impact rated goggles over them.
Or get actual safety goggles instead of something made for a different purpose?
They don't make safety goggles for gas, those are called gas masks and if you have an extra 600 bucks or so kicking around for a respirator with an impact rated face shield that is absolutely the best tool for the job. For the rest of us $20 for swim goggles, safety glasses, and an N95 is likely to be "good enough".
N95 is probably better than nothing, but for these purposes it's probably far from good enough
Most pepper sprays and such are oil based, and n-rated respirators are not oil resistant. For that you really want an R-, or even better P-rated mask for oily mists.
Disposable masks suitable for that do exist, but more often you're going to find reusable cartridge-based ones which will have some additional ratings that probably aren't relevant to specifically pepper spray but could maybe be relevant for other
White labeled cartridges are suitable for acid gases like chlorine
Black labeled are suitable for organic vapors like from paint thinners and other solvents
Yellow are suitable for both
Green are rated for ammonia and methylamine
Which respirator cartridges are the "normal" ones you get at the hardware store? Yellow?
I don't exactly go respirator-shopping super often, and I of course have no idea what stores around you stock, but dn my experience, yellow and black are pretty widely available, and I don't think that I've ever personally seen white or green in the wild, but I've also never specifically gone shopping for them either, since my main use case is for things like spray paint so I'm mostly concerned with organic solvents fumes.
A pair of safety goggles that seal well against your eyes will help you a ton against tear gas. You're still going to have breathing issues but you'll avoid the eye pain.
I used this trick when I needed to cut lots of onions.
Gas masks just aren't practical for large crowds due to the expense/training required. You're looking at $150 new, filters being about $40+ new. Sure you can get surplus for cheaper if you can find it, but most people can't, not enough to go around.
Also filters should be replaced after being esposed to chemicals they're designed to protect against. You probably could get away with using tear filters exposed to year gas.
I mean, sure, the cheap safety googles (like this, not this) aren't going to be perfect against a tear gas canister or something like that, but I assume they'd at least help some (buying you time to act before it starts seeping in), and be half-decent against directed sprays. I guess if you really wanted to wear swimming goggles under them you could, but it almost seems like overkill unless you plan to be right up on the front line, goading the ICE goons to mace you.
My first inclination would've been to just grab the PPE I already have for home DIY (spray painting and such), which are googles like above, paired with a reusable half-face respirator with P100 cartridges (a 3M 65021, I think). If cobbling together sports equipment really is better than that, I want to understand why and I'm not sure I do yet.
Also, even if we are talking about a full face respirator, where'd you come up with the $600 figure? What's wrong with something like a 3M 6800 for $125?
P100 works on particulates only. To protect from tear gas, you'll need carbon / charcoal, gas filters. Look for painting filters.
Some P100 filters also have gas filters. Make sure you know what you have before you rely on it.