Buildings represent habitats for various airborne pollutants that have direct or indirect effects on the quality of the living spaces, human health, productivity and well-being. The first research theme in centered on better understanding the physics and chemistry that influence concentrations, dynamics and fates of air pollutants within buildings. The special emphasis is given to understanding physical and chemical processes influencing the dynamics and fate of air pollutants, spatio-temporal variation of pollutants in indoor air, as well as development and application of methods for air quality investigation, including optimal sensor placement, which is vital in relation to developing control strategies to mitigate human exposure to air pollutants.