Professor Salonen's expert areas include: Common factors of indoor air quality; Health effects of indoor air contaminants; Exposure to indoor air contaminants; Assessment of indoor air quality; Material emissions and the effects of building materials on indoor air; Microbiology (measurement methods, laboratory analysis, data analysis); Indoor environment chemistry (measurement methods and laboratory analysis, data analysis); Man-made mineral fibers (MMMF) (measurement methods, laboratory analysis, data analysis); General principles for setting guidelines for indoor environments; Good practice in evaluating indoor air problems; Multi-professional team work; Physical characteristics of the indoor environment that affect health and wellbeing; Design approaches for promoting beneficial indoor environments.