Indoor/Outdoor Spore Ratio Clearance Screen
The everyday mold clearance read: post-remediation indoor airborne spore concentration should sit at or below the outdoor control (ratio at or under 1), with no indoor-dominant water-damage marker genera (Stachybotrys, Chaetomium) elevated inside. Computes the indoor/outdoor ratio and screens the marker flag. A screen, not a clearance certificate; an independent environmental professional interprets the genera and the full criteria (ANSI/IICRC S520).
Formula and source
io_ratio = indoor_spores_m3 / outdoor_spores_m3; pass when io_ratio <= 1 and no indoor-elevated water-damage marker (indoor_marker == 0).
Indoor/outdoor airborne-spore comparison and the marker-genera (Stachybotrys / Chaetomium) principle of ANSI/IICRC S520, by name. Not edition-bound.
Audience
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Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.