This dataset aims to provide high-quality validation data on pollutant concentrations for studying air pollution dispersion in urban environments. The measurements were conducted for a central area of Sofia, Bulgaria, covering a region with a diameter of approximately 0.91 km. Experiments were performed at the closed-circuit atmospheric boundary layer wind tunnel (ABLWT) facility of Eindhoven University of Technology, using a geometric scale of 1:350, resulting in a blockage ratio of less than 5%. Pollutant concentrations were measured at 76 locations distributed throughout the target area for two different point source locations (S1 and S2), at a reduced-scale height of 5 mm. This resulted in two independent datasets representing dispersion from S1 and S2. Pure ethylene was used as a tracer gas, and the release was neutral, not accounting for any buoyancy effects. The tests were conducted for the prevailing wind direction of west-northwest i.e., at 293° with 0° corresponding to true north. The ABL generated represents the flow over rough terrain as per the VDI-3783 guideline. In addition, tests for Reynolds number independence, source strength sensitivity, and multiple repeatability tests were conducted to quantify experimental uncertainty.
In addition to the Metadata report, raw data time series of pollutant concentrations as well as appraoch flow conditions, and ambient conditions for the conducted measurements are provided here.
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