The GOME-2/Metop-A,B and C NO2 Level 3 products were generated using the AC SAF prototype Level 2 product. Only quality-screened Level 2 data were included, applying optimized filtering criteria to ensure data reliability. Monthly Level 3 products were produced by spatial binning onto a regular latitude–longitude grid using an area-weighted averaging approach. The weighting and count vectors are used to consistently apply this weighted averaging during the Level 3 gridding, enabling the calculation of mean values and associated uncertainties.

Detailed information on the Level 3 algorithm can be found in the Algorithm Theoretical Basis Document (ATBD).

The version number is 1.0. The data are provided in NetCDF format.