The aim of a study is to determine if on site, in a call-centre of 4600 m2, a correlation can be found between ventilation rate and performance of worker. No clear effect of ventilation rate on worker performance has been found in this case on the air flowrate variation range (12 to 48 l/s). Yet some improvements of performance are shown at very high ventilation rate.

Three offices ventilated with charcoal filtered outdoor air were investigated with different air change rates, ozone level and limonene, using the perception of a sensory panel. Results confirm that ventilation is necessary for ensuring good indoor quality even in low-polluting offices.

A simple method was used to assess odor intensity in indoor environments by a trained panel. Reliable results were obtained. Other factors, i.e., interaction with other senses, annoyance and other cognitive processes seemed to influence individual evaluation, especially during adaptation. Therefore, laboratory experiments could be useful to assess immediate odor intensity with minimum context influences. Comparison of odor sampled in Tedlar bags and in the living room were acceptable in terms of intensity but not in terms of recognition and description, indicating presence of biases.

This study investigated if low air temperature, which is known to improve the perception of air quality, also can reduce the intensity of some SBS symptoms. In a low-polluting office, human subjects were exposed to air at two temperatures 23 C and 18 C both with and without a pollution source present at the low temperature. To maintain overall thermal neutrality, the low air temperature was partly compensated for by individually controlled radiant heating, and partly by allowing subjects to modify clothing insulation.

30 human subjects were exposed to simulated office conditions to study perceived air quality and sick building symptoms. The sensory pollution load of personal computers was found to be 3 olf each.

Perceived air quality and sensory pollution loads were measured in 6 office buildings in Denmark with a panel of 43 subjets on a normal weekday and on a weekend. Results are presented and discussed.

The relationship between outside air ventilation rate and indoor VOC concentrations was studied through measurements in an office building (the call center of a health maintenance organization - 4600 m2 - 290 persons). Direct relationships between ventilation rate and concentrations were not found for most VOC's.

Physico-chemical and microbiological measurements (temperature, humidity, CO2, CO, VOC, bacteria and fungi) were performed on indoor air of three schools near Paris (France). Results of measurements are given and analysed. Indoor air quality is better with mechanical ventilation than in operable windows classrooms. TVOC concentrations are much higher indoors than outdoors.

Indoor environmental measurements (temperature, CO2, formaldehyde, TVOC) were operated in 28 classrooms in Warsaw (Poland). The classrooms were equipped with natural ventilation systems. Air change rates were calculated from CO2 concentrations. Results are compared with Polish regulation and international requirements and standards. The natural ventilation systems applied in all schools do not ensure proper ventilation rate.

Four relocatable classrooms were designed, constructed and tested in Californian schools to demonstrate technologies that improve energy efficiency and indoor environmental quality. First results such as CO2 and particle concentrations are presented and discussed.