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Undertoad · 11-19-2019, 12:34 PM

Yup that seems to be what the size is about... there is also a PM10, but that is apparently just annoying, compared to PM2.5 which is supposed to be dangerous.

11-19-2019, 12:34 PM	#2599
Undertoad Radical Centrist Join Date: Jan 2001 Location: Cottage of Prussia Posts: 31,423	Yup that seems to be what the size is about... there is also a PM10, but that is apparently just annoying, compared to PM2.5 which is supposed to be dangerous.