This collaborative research program between Aerodyne Research, Inc. and Boston College (AR.UBC) has studied the heterogeneous gas-liquid interactions related to ozone formation and destruction processes in the atmosphere. This involves laboratory determination of gas/liquid mass transport rates using bubble column and droplet apparatuses capable of measuring both fast and slow heterogeneous processes. The research plan was to study heterogeneous chemistry of nitrogen containing species, including ammonia NH, and so-called 'NO' gas phase species (including NO, NO(2), NO(3), HNO(2), and CH(2)O) on atmospherically relevant aqueous solutions (including sulfuric acid and nitrosyl sulfuric acid).