How long a smell or sound remains detectable after its trigger begins or ends.
Use
This value describes an observation series and should be read with the underlying dates, locations and methods.
Unit discipline
Do not combine readings from incompatible instruments or locations into one apparent trend.
Observe→Distinguish→Control source→Verify
Living dossierPublished knowledge is connected and improved as new cases, images and outcomes are added. Updated 2026-07-20.
