All data were recorded at the Cinestar Cinema in Mainz, Germany between December 1st, 2013 and January 14th, 2014. Of the 14 screen multiplex, two separate screen rooms were used (Kino 2, capacity 230, and Kino 7, capacity 230). During a film, the entrance doors were closed and ambient air was circulated from outside into the room through vents under the banked seating and out via ceiling mounted openings such that the screening room was flushed entirely circa 6 times per hour. The measurement instruments (PTR-MS-ToF and the CO2 detector) were located outside the screening room (to avoid possible noise) and next to the outgoing air vent. An inlet was inserted into the midpoint of the exit flow and a 2 L/min was drawn through 14′′ Teflon line continuously. From this line the PTR-MS-ToF and CO2 instruments sampled at 100 ml/min and 1.5 L/min respectively.
