In this study we compare the results of model simulations of CFC-11 in the National Center for Atmospheric Research (NCAR) Community Climate Model (CCM2) with two different published emission distributions. We find that for predicted CFC-11 concentrations at the Atmospheric Lifetime Experiment/Global Atmospheric Gases Experiment (ALE/GAGE) observation sites there is very little difference resulting from the two distributions. However, the difference is apparent in major transport events such as pollution events. This has important implications for assessment of regional emissions from a sparse network like ALE/GAGE using inverse methods. It also implies that differences between modeled and observed CFC-11 concentrations are due predominantly to model transport errors not model emission errors. ¿ American Geophysical Union 1996