
Skýringarmynd sem sýnir þvermál svifryksagna í samanburði við þvermál mannshárs og fjörusands. Lengdareiningin míkron er einn milljónasti úr metra. PM er skammstöfun á ensku orðunum particulate matter.

Svifryk af mannavöldum kemur frá svo að segja allri starfsemi, en mest frá bruna eldsneytis, umferð og iðnaði.
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