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A method for simulating NOx dispersion in an urban area using ENVI-met

This paper explores a method for the simulation of oxydes of nytrogen (NOx) in an urban environment. A section of downtown Curitiba, Brazil has been modeled, using data gathered from city plans, satellite photographs and visual surveys; weather data at street level have been gathered by means of field monitoring and used for calibration of the model, focusing on the wind speeds within the urban canyon. Roadside noise level measurements and vehicle counting have been used to determine hourly traffic patterns. NOx emissions from vehicle exhaust were modeled using ENVI-met's dispersion modelling functions. The model construction and calibration workflow is discussed in detail, and the results of three different simulation scenarios are analyzed and discussed in relation to Brazilian air quality standards.