The vertical profile and total column concentration of HC1 have been measured from ground based high resolution infrared absorption spectra. The lines recorded were the R1 and P5 of HC135 at 2942.731 cm-1 and 2775.760 cm-1 respecitvely. Vertical proviles and column concentrations are reported for different seasons. Measurements indicate an HC1 volume mixing ratio equal to (2.2¿0.5)¿10-11 at 10 km increasing to (3.4¿0.6)¿10-9 at 33 km.