The new units of perceived air quality, the olf and the decipol, are introduced. Research using these units has been used to argue that current recommended ventilation rates are inadequate for comfort. The derivation of theunits is questioned and it is proposed that theirapplication be delayed until the methodology has been fully validated.
The Dutch "E'novation" program is a national demonstration program in which dwellings with high energy consumption, moisture and mould problems and poor indoor air quality were renovated, with special attention to the selection of the heating and ventilation systems, thermal insulation and the buildings' physical details. A number of indoor air quality parameters were monitored before and after renovation, showing an important improvement in the indoor air quality. Moreover, total energy consumption decreased by 33%, which meets the targets of the Dutch National Environment Policy.
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