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A study of pollutant concentration variability in an urban street under low wind speeds

2008; Wiley; Volume: 9; Issue: 3 Linguagem: Inglês

10.1002/asl.184

1530-261X

Damien Martin, C. S. Price, Iain R. White, G. Nickless, Alexandru Dobre, Dudley E. Shallcross,

Atmospheric chemistry and aerosols

Abstract The short time‐scale variability in pollutant concentrations in an urban street under very low wind speed conditions and short source–receptor distance has been investigated using the inert tracer sulfur hexafluoride (SF 6 ) as a continuous point‐source (release times ≥ 5 min), and fast detection using separation by gas chromatography coupled with a μ‐electron capture detector (ECD). The results are complex but can be broadly interpreted in terms of horizontal wind speed and direction coherence. Comparisons with a simple dispersion model suggest that observed time‐averaged maximum concentrations approach predicted values, whilst instantaneous maximum concentrations vary greatly and would therefore be difficult to predict. Copyright © 2008 Royal Meteorological Society