alt Hacker News>Roughly 50% of indoor dust is composed of microplastics, so it's not like it's uncommon.
I highly doubt that. Soil, skin and pollen are usually the big ones. Hairs depending one how you count dust, but eliminating hair like fibres would also eliminate most of the sources of plastic, unless you allow really large particle sizes.
[edit] Checking research. The highest claim I found was 39% of fibres (in household dust, Japan). but that seemed to be per particle not by volume.
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Thanks and noted, I'm happy to accept your figure. Even at 40% by number density that still means microplastics are hardly rare. I don't need to nitpick the exact number.
It was just an aside anyway. My main point is that MPs are vehicles for toxins, which addresses the original question about how (supposedly inert) microplastics can cause harm.
Thanks again for setting me straight, I must have misremembered.
Synthetic fibers from clothes are microplastics, and clothes shed lots of fibers. Not to mention all the upholstered furniture, carpet, rugs, drapes, bags, etc.