air pollutant

Flow and turbulence in idealized urban canopies

Flow and turbulence in idealized urban canopies

Flow, turbulence, and dispersion in two- and three-dimensional urban canopies are studied experimentally in a water channel. Velocity measurements are taken using laser velocimetry, while pollutant concentration is measured using image analysis (PLIF).

Facilitating Bus Fleets Emissions Assessment

Environmental issues are an imperative concern for bus companies. But, when it comes to estimating pollutant emissions, problems arise, typically: the underestimation of the local fleet potential in producing pollution (especially in case of small fleets); and the reluctance to estimate that when the fleet is composed by a not negligible amount of old-generation vehicles. To this end, an integrated emission-estimation model for bus fleets is developed and described in the paper, with the research goal to facilitate the emissions calculation task for transit operators.

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