street pollution concentration Articles

  • Assessment of traffic congestion in Hong Kong, and prediction of street-level CO concentration using a graphical screening method

    The rapid growth in vehicle population and traffic volume in the past few years has offset the efforts of government to improve the poor traffic conditions in Hong Kong. This has intensified traffic congestion and hence the traffic-related pollution problems in the territory of Hong Kong, particularly in urban areas. Prediction was carried out using a simple graphical screening (SIMGS) method to ...


    By Inderscience Publishers

  • Dependence of street canyon concentrations on above-roof wind speed - implications for numerical modelling

    For microscale numerical modelling of street canyon air pollution, the traffic-related component of the total ambient pollutant concentration is often assumed to be inversely dependent on the wind-speed at rooftops for idealised conditions of neutral stratification, no solar radiation, and no traffic-induced turbulence. Detailed data analyses of two comprehensive datasets from Gottinger Strase ...


    By Inderscience Publishers

  • Air pollution in a street canyon estimated considering different parameterisations of vehicle–induced turbulence

    Leeward air pollutant concentrations (C) are estimated by incorporating four parameterisations of traffic–produced turbulence (TPT) into the scaling of C inside a street canyon. Three parameterisations consider expressions previously introduced by other authors, based on a theoretical formulation of TPT and a semi–empirical approach already incorporated in an operational street model. The fourth ...


    By Inderscience Publishers

  • Air pollution dispersion inside a street canyon of Gottinger Strasse (Hannover, Germany): new results of the analysis of full scale data

    This study analyses the interactions between pollutant concentrations inside a street canyon, and wind and traffic dispersive air motions. Air pollutant concentrations, meteorological parameters and traffic flow continuously measured in Gottinger Strasse (Hannover, Germany) were used in calculations. Parameters included in the inverse proportionality between concentration and a dispersive ...


    By Inderscience Publishers

  • Parametric study of the dispersion aspects in a street-canyon area

    Most modern cities practically consist of street canyons, making monitoring of the level of their pollution an important issue. In this study, a Computational Fluid Dynamics (CFD) simulation of pollutant dispersion was performed for a real, complex-geometry street canyon for various wind directions and speeds. Typical street-canyon effects – like the formation of a longitudinal vortex for wind ...


    By Inderscience Publishers

  • Evaluation of street sweeping and washing to reduce ambient PM10

    This paper presents an evaluation of street sweeping and washing by PM10 measurements and determination of silt load from active traffic streets. A modified Regenerative-Air Vacuum Sweeper (RAVS) and a washer were used. It was found that the impact of sweeping alone on ambient PM10 concentrations was short-lived, lasting no more than about 2?3 h. The method of sweeping followed by washing tested ...


    By Inderscience Publishers

  • The study of traffic hotspot air quality and street scale modelling in the Street Emission Ceilings (SEC) Project

    The introduction of local scale analysis in Integrated Assessment Modelling (IAM) requires an evaluation of road transport emission factors and local scale air quality models. The comparison of PM10 and PM2.5 over NOx delta (street level minus background) concentration ratios against emission ratio estimates, confirms the appropriateness of the COPERT methodology. The comparison also reveals the ...


    By Inderscience Publishers

  • An application of ventilation efficiency concepts to the analysis of building density effects on urban flow and pollutant concentration

    This paper is devoted to the study of flow and pollutant dispersion within different urban configurations by means of wind tunnel experiments and Computational Fluid Dynamics (CFD) simulations. The influence of the building packing density was evaluated in terms of ventilation efficiency. We found that air entering the array through the lateral sides and that leaving through the street roofs ...


    By Inderscience Publishers

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