The decipol is a unit used to measure the perceived air quality.Fanger, O. P.: Introduction of the Olf and the Decipol Units to Quantify Air Pollution Perceived by Humans Indoors. In: Energy and Buildings. 12, 1988, 1-6 It was introduced by Danish professor P. Ole Fanger.
One decipol (dp) is the perceived air quality (PAQ) in a space with a sensory load of one olf (one standard person) ventilated by 10 L/s. It was developed to quantify how the strength of indoor pollution sources indoors influence air quality as it is perceived by humans.
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