People have been building these things for years in the Bay Area now with 1 filter (strapped to the back) or 2 (making a triangular prism), to deal with the smoke from the fires. Surprised that isn't mentioned in the article. I first learned about them in 2017 but I'm sure people were doing it prior.
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People have been building these things for years in the Bay Area now with 1 filter (strapped to the back) or 2 (making a triangular prism), to deal with the smoke from the fires. Surprised that isn't mentioned in the article. I first learned about them in 2017 but I'm sure people were doing it prior.