Work due 01 Jan 2099

SO 2 Improvement of coverage in space and time; extrapolation to total (urban + rural) population. PM 10 Improve information on station type characteristics. Improve information on whether countries have applied correction factors for non-reference methods, and if so, which factors have been applied. Improvement of coverage in space and time; extrapolation to total (urban + rural) population. NO 2 Improvement of coverage in space and time; extrapolation to total (urban + rural) population. Improve consistency in station type characteristics ("urban background" and "sub-urban background") assignments between the measurement network and national data suppliers. O 3 Improvement of coverage in space and time; extrapolation to total (urban + rural) population. consideration of spatial differences throughout Europe. Improve consistency in station type characteristics ("urban background" and "sub-urban background") assignments between the measurement network and national data suppliers.