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The Decipol is a unit used to measure the perceived air quality. 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.
References
Decipol Wikipedia(Text) CC BY-SA