Hydrofluorocarbon-134a (CF3CH2F) has been detected and quantified in air samples collected at remote, globally dispersed locations. Using gas chromatography and mass spectrometry detection techniques, we have observed increases for HFC-134a throughout the global troposphere from <50 fmol mol-1 (ppq) in the late 1980s to 1.6 pmol mol-1 (ppt) in mid-1995. Results obtained from samples collected during two cruises in 1994 indicate that mixing ratios more than doubled during that year. Increases observed globally from early 1994 through mid-1995 are consistent with exponential growth at ~100% yr-1. ¿ American Geophysical Union 1996