The olf is a unit used to measure the strength of a pollution source. It was introduced by Danish professor P. Ole Fanger; the name "olf" is derived from the Latin word olfactus, meaning "smelled".
One olf is the sensory pollution strength from a standard person defined as an average adult working in an office or similar non-industrial workplace, sedentary and in thermal comfort, with a hygienic standard equivalent of 0.7 baths per day and whose skin has a total area of 1.8 square metres. It was defined to quantify the strength of pollution sources which can be perceived by humans.
Examples of typical scent emissions
|Sitting person||1 olf|
|Heavy Smoker||25 olf|
|Synthetic fibre||0.4 olf/m²|
|Rubber gasket||0.6 olf/m²|
- Fanger, P. O. (1987). "Introduction of the olf and the decipol Units to Quantify Air Pollution Perceived by Humans Indoors and Outdoors" (PDF). In Energy and Buildings 12 (1), pp. 1–6.