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The influence of micrometeorlogical factors on air quality within urban street canyons

Andrew Jackson



A pollution monitoring and modelling study has been carried out on a low street canyon (height to width ratio = 0.53) in a suburb of Leeds, Headingly with the aim of determining the micrometeorological influences on pollution concentrations and dispersion.  Pollution monitoring was carried out under a variety of meteorological conditions, over ten separate days using a mobile atmospheric unit and measurements were taken for five pollutants, NO, NOx, CO, O3 and NO2, along with three meteorological variables, wind direction, wind speed and temperature.
Two models have been employed to simulate the flow, turbulence and concentration fields within the canyon: the CFD model code, Fluent and the empirical air quality management package, Airviro.


The results showed

This study highlights the need for extensive experimental data, with measurements made at both side walls, from the base of the canyon up to the roof level, so that numerical models such as fluent can be correctly validated.