BUBBLE stands for 'Basel UrBan Boundary Layer Experiment' and is a research project directly associated to the European COST (cooperation in science and technology) initiative. Cost action 715 deals with 'Meteorology applied to urban air pollution problems'. The project, which was due to funding restrictions originally purely Swiss, has been growing rapidly since its start. By now many research groups from all over the world are participating (Table I). The philosophy of BUBBLE is based on the recognition that over complicated and essentially inho-mogeneous urban surfaces both the near-surface turbulence exchange processes and the entire boundary layer structure have to be observed at the same time.
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