The Level 3 standard products contain climatological datasets obtained as aggregated products from the fully quality controlled (QC) aerosol optical products (i.e. Level 2 products). In order to avoid biases due to measurements made on purpose specifically for capturing special events, it is considered only subset of data corresponding to regular schedule and measurements done for satellite validation purposes (i.e. climatological and calipso category files following the current EARLINET database organization [Pappalardo et al., 2014]).

Data are organized for stations in order to allow future updates of the climatological products even at station level. For each station, three types of data are released: profile values, integrated quantities, layer statistics. For each type of data, four different temporal aggregations are provided: seasonal, annual, normal seasonal, normal monthly.

For further details please refer to the following documentation: Download the Level 3 Product Catalogue.