total of 39 passive samplers containing the Tenax TATM car- tridges were placed in the spiked room. Samplers were placed at 1.5 m from the roof with enough space between them to allow the air to circulate. A small 30 cm × 30 cm opening in the room allowed the air to enter thus promoting air circulation. During sampling, the humidifier delivered water vapour into the room in order to