Nowadays, people spend the majority of their time indoors. It is important to ensure a healthy indoor environment for the occupants as well as their well-being. Moreover, it is important to guarantee clean air to the occupants without compromising their thermal comfort. Generally, the improved IAQ is in contrast with energy-saving measures. For this reason, there is a crescent interest in focusing only on the occupied zone with the application of local exhausting. The thesis focuses on the effects of the application of local exhaust and the locations of air terminal devices on indoor airborne transmission. The study was conducted in a test chamber at Aalto University, set up as a meeting room.