The COST 726 Aerosol Climtology over Europe (25°W to 35°E and 31°N to 80°N) consists of monthly mean values of AOT at 308 nm in one data file (ascii).
If altitude is higher than 1 km the following correction should be applied: AOT=AOT / (altitude[km])^1.65
Further:
Angstrom coefficient: 1
Single scattering albedo: 0.94
Asymmetry factor: 0.75
This climatology is free for non-comercial use.