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Air purifier necklaces are another excellent idea for personal air purification
Wow! This wearable air purifier is so futuristic! It seems like something you would wear to outer space. https://www.youtube.com/watch?v=ElYx1b78CZE
Cool, you can listen to music and breathe clean air.
Wearable air purifier masks are a good alternative to ordinary masks, but might be a bit uncomfortable due to the added weight.