But since you're in California, they'll also make wonderful, but expensive, dust masks in case the Big One reduces our cities to big mounds of concrete dust. Or in case the wind blows smoke from wildfires your way.
I've got some Isolation Masks here that are marked "99% EFF at .1 Microns" and I did use one during a wildfire; it made a huge difference.
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Better is the Enemy of Good Enough. Okay, what’s your point??
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