FWIW if you can slow down and handle the increased pressure drop you might try a valved n95 for smoke days, there's a lot of cumulative damage you get from repeated PM10 and PM2.5 inhalation.ATTQOTD: I try to avoid running when I can smell/taste the smoke in the air (which is why I’m glad I ran before work yesterday, when there was wind out of the south blowing the smoke back toward Canada, instead of after work when there was WNW bringing it back)
I felt like I was transported to Krypton during my Tuesday run (there are no cloud in the sky in this picture, it’s pure smoke haze)
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I think there's a gap in the marketplace for this, actually with climate change making forest fires longer and more severe. There really needs to be a lightweight, very high surface area, and water resistant PM2.5 filter for exercise.