of perceived indoor air quality
, measured indirectly from the concentration
of carbon dioxide and the amount
of fresh air supplied. Higher the decipol number, more polluted the air. On a mountain or sea, the air is 0.01 decipol; outside-city air, 0.1 decipol; city air with moderate air pollution
, 0.03 to 0.05 decipol; healthy building
, 1.0 decipol; acceptable indoor air, 1.4 decipol; sick building, 10 decipol; tobacco smoke
, 14.4 decipol. Invented in 1988 by the Danish environmental scientist, P. O. Fanger. See also olf.