The URGENT thematic programme was set up to integrate urban ecological and environmental research. It gathers together research projects related to Soil, Water, Ecology and Air Sciences. Data issued by the latter are archived at BADC. These mainly include ground based measurements in the vicinity of urban areas but also observations from aircraft, lab measurements and model results. Recorded parameters include atmospheric chemicals and aerosols, photolysis rates and meteorological variables. The largest atmospheric science related project is the PUMA consortium, which also has links with many of the other "Air" projects.