The possibility of significant losses of chlorofluoromethanes and their photochemical products in the troposphere or atmosphere has been examined. A number of laboratory measurements have been carried out involving possible ambient positive and negative ions and CFCL3, CF2Cl2 and HCl. No reactions between ions expected to have significant concentrations and these species have been observed. It appears that the reactions which might have been important are in fact endothermie. This is a result of normal atmospheric chemistry leading to very stable ions on a very short time scale. We conclude that ion-molecule reactions do not play a significant role in restricting the lifetime of CFCl3 or CF2Cl2 in the atmosphere or in removing the reactive products Cl, HCl, and ClO.