Urban flows around buildings can be complex and hard to account for when estimating pollutant ingress. There is a lack of experimental evidence for how factors such as wind direction in an urban neighbourhood influence infiltration, which is significant in the older building stock in the UK. This study presents findings from a study in central London, UK. Measurements (in collaboration with the Building Research Establishment) were taken at the Westminster City Council House (WCC), located next to a heavily trafficked street. Two different methods of calculating infiltration rate were compared: one method using observations of pollutant concentrations inside and outside the room to give hourly values, and the other giving weekly values using a tracer gas decay method. The two methods agreed reasonably well - analysis of the hourly values showed that wind direction with respect to the local street geometry plays an important role in controlling infiltration rates.
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