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For a really thorough explanation of how MERV ratings are calculated, see this summary from the National Air Filtration Association

If I were a painter And could paint a memory I'd climb inside the swirling skies to be With you I'd climb inside the skies to be with you One flight down One flight down There's a song on low And your mind just picked up on the sound Now you know you're wrong Because it drifts like smoke And it's been there playing all along Now you know Now you know The reeds and brass have been weaving Leading into a single note In this place Where your arms unfold Here at last you see your ancient face Now you know Now you know The cadence rolls in broken Plays it over and then goes One flight down There's a song on low And it's been there playing all along Now you know Now you know Nightingale Nightingale Sing us a song Of a love that once belonged Nightingale Tell me your tale Was your journey far too long

Upholstered furniture can be particularly challenging: For wood furniture, wipe down with a vinegar solution to remove the residue layer that holds smoke odour

Different sources and human activities produce PM of various sizes, and PM has been extensively utilized in monitoring air pollution [208]