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This is pretty low on the Pareto curve of protecting yourself from air pollution. Get good air filtration for your house and buy a HEPA cabin air filter for your car, and you're covering 90% of your bases. Buy a PM detector to verify they work and are sized correctly.
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It may feel awkward, but I don't think it's rude. Getting stared at for wearing a mask can feel awful at first, but over time, it feels less emotionally charged, takes up less attention, feels more normal.
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