Pollution due to urban traffic is a very high proportion of the overall pollution in a big town like Madrid. In a recent study, emissions of CO, NOx, SO2, hydrocarbons, etc. have been calculated based on intensity of traffic and fuel consumption. At the same time, a complete grid of pollution stations, set by municipal government, are computing half-hourly data about pollutant concentrations and other meteorological parameters. Many models have been designed for pollution spread but none refer to Madrid, so those existing were studied to identify the one which best fitted the conditions in the Spanish capital. As there is not an accurate dispersion model for Madrid, a general dispersion model was tested, only for traffic pollution, considering a linear and infinite source. This one was checked with measured data from pollution stations. The model chosen used several parameters to compute the concentrations of pollutants at ground level. All these variables and information have been introduced in a GIS and the mathematical model was run with the last one and then the results were mapped. This tool enables any other model or algorithm to be used.
Abstract