The GOZCARDS Source Data for Hydrogen Chloride 1 month L3 10 degree Zonal Averages on a Vertical Pressure Grid product (GozSmlpHCl) contains zonal means and related information (standard deviation, minimum/maximum value, etc.), calculated from original Level 2 satellite instruments and products. The source HCl data are from the following satellite instruments: HALOE (v19; 1991 - 2005), ACE-FTS (v2.2u; 2004 - onward), and Aura MLS (v3.3; 2004 - onward). The vertical pressure range for HCl is from 147 to 0.5 hPa. The source data are used to create a merged product contained in a separate data product with the short name GozMmlpHCl. The GozSmlpHCl source data are distributed in netCDF4 format.