7. Glossary

Odor concentration; Concentration d'odeur

Number of European odor units in a cubic meter of gas under standardized conditions, obtained by sensory measurement; expressed in u.o _E /m ³ .

Physico-chemical concentration; Concentration physico-chimique

Quantification (in mass or mole) of chemical compounds obtained by instrumental measurement, expressed in mg/m ³ , µg/m ³ , ppm, ppb, etc.

Seuil de perception; Perceptual threshold

This is a theoretical concept in psychophysics which defines the limit below which an individual can no longer detect stimulation. This threshold can only be determined...