This Collection provides the Sentinel-3 Synergy Level-2 Aerosol Optical Depth product, which is a downstream development of the Sentinel-2 Level-1 OLCI FR and SLSTR Radiances and Brightness Temperatures products. The dataset provides both retrieved and diagnostic global aerosol parameters at super-pixel (4.5 km x 4.5 km) resolution in a single NetCDF file for all regions over land and ocean free of snow/ice cover, excluding high cloud fraction data.