The TROPOMI Ozone column for the troposphere (O3_TCL) provides the tropical tropospheric ozone column between the surface and a fixed pressure level of 270 hPa, based on the Convective Cloud Differential (CCD) algorithm. This data is available only in the non-time-critical (OFFL) data stream and is provided as a once per day file. Based on the methodology, this data is only calculated for the tropical zonal region based on known cloud properties in this zone.