The annual percentage increases in concentrations of the chlorofluorocarbons CF2ClCFCl2 (CFC-113, and industrial solvent) and CHClF2 (CFC-22, a refrigerant) are the highest among major chlorofluorocarbons in the atmosphere today. We have computed the present-day atmospheric lifetimes for these species using a global three-dimensional dynamical-chemical model. The present-day lifetimes of both are long (15.5 years for CHClF2, and 136 or 195 years for CF2ClCFCl2 depending on assumed O2 absorption cross-sections) underscoring the need to decrease their emissions in order to minimize their future role in ozone destruction and greenhouse warming. ¿ American Geophysical Union 1989