http://socialbookmarksite.xyz/story.php?title=masks-breathing-helmets-environmental-exposure-risk-reductions I’ll hold my breath anytime I’m close to engines/tailpipes emitting something. Sometimes I hold a full breath, sometimes it’s a half-breath. That helmet-related apart turned right into a paragraph, then into an enormous footnote, then I decided to tug the entire conversation into it’s personal piece, and this is what you’re studying now. Then I ended up studying one thing that clicked as ‘oh, that makes sense’ as soon as I read it. Mon, 20 Apr 2026 16:29:03 UTC en