We explore the use of two cosmogenically produced nuclides in the atmosphere, 35S (half-life=87 days) and 7Be (half-life=53 days), as tracers of gaseous SO2 and aerosol SO4 and Be removal processes to the Earth's surface. Based on 35S and 7Be wet precipitation fluxes and 35SO2, 35SO4 and 7Be concentrations in air samples in the planetary boundary layer at New Haven, Connecticut (USA) we determine coefficients for incloud scavenging of 35SO2, oxidation of 35SO2 to 35SO4 in both the planetary boundary layer and the free troposphere, and dry deposition. In addition, the distributions of 35SO2, 35SO4 and 7Be between the planetary boundary layer and the free troposphere are determined as well as the air exchange coefficient between the two reservoirs. Application to stable S yields a dry deposition flux to total flux ratio of about 0.20 for August, 1990. ¿ American Geophysical Union 1992