Comment by schiffern

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.