I work with meth heads. Even they will wear masks for 8 hours in 90+ degree building. When you are sinking below meth head, you need to look at yourself.
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The main problem with dust storms isn't the dust itself (although breathing that in isn't great). It's the stuff that comes with it. There's a fungus that gets kicked up, and breathing it in lets it take root in your lungs and causes all sorts of problems.