PM2.5 is the really nasty carcinogenic stuff, but pollen size overlaps substanti...

		hinkley 1 day ago \| parent \| context \| favorite \| on: Scented products cause indoor air pollution on par... PM2.5 is the really nasty carcinogenic stuff, but pollen size overlaps substantially with other forms of soot and IIRC is a double digit percentage of poor urban air quality. It’s somewhere around fourth or fifth largest source.