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  • n. A unit of perceived air quality.

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  • an empirical unit of indoor odor intensity introduced by the Danish environmental scientist P.O. Fanger in 1988. One olf is defined as the indoor odor intensity produced by one "standard person", and one decipol is the perceived odor intensity level in a space having an odor source of strength one olf and ventilation at the rate of 10 liters/second with unpolluted air. Measurements are recorded by human observers using protocols laid out by Fanger and his colleagues.

    January 21, 2008