At Swedish Tobacco we have developed a protocol for the evaluation of small scale smoking-rooms used in workplaces and other public areas. The protocol is meant to indicate if a smoking-room design will make it suitable for the intended use. The commercially available smoking-rooms are built as a room-within-a-room with transparent walls and with air-cleaning devices on the roof. The air-cleaning device contains a particulate cleaning step and a VOC cleaning step. We have evaluate a number of smoking-rooms meant for 6 to 8 smokers. Smoking-rooms were provided by the manufacturers in standard designs. The aim of our study was mainly to document the impact of the smoking-room in normal use on the air quality of the surrounding room. We monitored the particulate retention, VOC retention, permanent gases emission, sound emission, energy consumption and air exchange rate of different smoking-rooms with smoke generated by smoldering cigarettes. Air samples were drawn before and after the air-cleaning device of the smoking-room. Smoking-rooms that were functioning well showed particulate retention > 98% and VOC retention > 95%. The air quality inside the smoking-room is depending on the ventilation rates. Details of smoking-room designs, air cleaning devices, analytical results and a general background to our involvement in this area will be given in the presentation.