Research Areas & Interests: aerosol science, physics and chemistry of indoor air, HVAC filtration, human exposure assessment, nanoaerosols, bioaerosols (fungi, bacteria, pollen, allergens), new particle formation, combustion aerosols, particle adhesion and resuspension, aerosol measurement techniques, fate and transport of VOCs/SVOCs, air quality in occupational workplaces, early-life/infant exposures, urban air pollution, low-cost air quality monitoring, building ventilation.