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A review of the characteristics of nanoparticles in the urban atmosphere 1 and the prospects for developing regulatory controls 2 Prashant Kumar , Alan Robins, Sotiris Vardoulakis and Rex Britter 3 Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK 4 Public & Environmental Health Research Unit, London School of Hygiene(More)
Wind tunnel experiments have been carried out at the EnFlo laboratory to measure mean and turbulent tracer fluxes in geometries of real street canyon intersections. The work was part of the major DAPPLE project, focussing on the area surrounding the intersection between Marylebone Road and Gloucester Place in Central London, UK. Understanding flow and(More)
8 The aim of this study is to assess particle number concentrations (PNCs) and distributions 9 (PNDs) in a car cabin while driving. Further objectives include the determination of the 10 influence of particle transformation processes on PNCs, PNDs and estimation of PNC related 11 exposure. On–board measurements of PNCs and PNDs were made in the 5–560 nm(More)
Currently, there are no air quality regulations in force in any part of the world to control number concentrations of airborne atmospheric nanoparticles (ANPs). This is partly due to a lack of reliable information on measurement methods, dispersion characteristics, modelling, health and other environmental impacts. Because of the special characteristics of(More)
Understanding the transformation of nanoparticles emitted from vehicles is essential for developing appropriate methods for treating fine scale particle dynamics in dispersion models. This article provides an overview of significant research work relevant to modelling the dispersion of pollutants, especially nanoparticles, in the wake of vehicles.(More)
A family of wall models is proposed that exhibit more satisfactory performance than previous models for the large-eddy simulation of the turbulent boundary layer over a rough surface. The time and horizontally averaged statistics such as mean vertical profiles of wind velocity, Reynolds stress, turbulent intensities, turbulent kinetic energy and also(More)
This study compared dispersion calculations using a street network model (SIRANE) with results from wind tunnel experiments in order to examine model performance in simulating short-range pollutant dispersion in urban areas. The comparison was performed using a range of methodologies, from simple graphical comparisons (e.g. scatter plots) to more advanced(More)
In this experimental work both qualitative (flow visualisation) and quantitative (laser Doppler anemometry) methods were applied in a wind tunnel in order to describe the complex 3-dimensional flow field in a real environment (a street canyon intersection). The main aim was an examination of the mean flow, turbulence and flow pathlines characterising a(More)