Research in atmospheric chemistry, aerosols and clouds is focused on understanding the chemically driven processes that affect the Earth's atmosphere. This includes examination of the fate and control of pollutant releases to the atmosphere and also the impact of processes involving chemistry, aerosols and clouds on precipitation and the Earth's radiation balance. Faculty at Georgia Tech have a long history of developing new instruments for measuring the composition of atmospheric trace gases and particulate matter. These instruments are used to study chemical kinetic mechanisms in the laboratory and to conduct field experiments at both regional and global scales. Large-scale computer-based atmospheric models cloud/aerosol interactions and for photochemical oxidant and airborne particulate matter formation and transport are developed and evaluated against field experimental data.