Calculo De Las Emisiones Vehiculares

The hot emissions of CO, NOx, SO2, TSP, and VOC´s were estimated for the traffic in Medellín city

(Colombia). The VOC emissions was grouped into 5 categories: metane, alkanes, alkenes, aromatics and

aldehydes. The total study area was 360 km2, involving a traffic net with its main avenues, streets and

highways. For the estimation of the emissions we developed a model that calculate the emission with a

spatial resolution of 1km2 and generates hourly average emissions. The datas used for the calculation were:

the vehicular flux evaluated in several places in Medellin in the period 1997 to 2000, number of cars by

hour, type of vehicles, longitude of the tram of a way and emission factor for heat emission (we use a

emission factor of CORINAIR study). As a result of the model, it was possible to determine the emission hour

by hour of the pollutants analyzed in the each cells. A picture of the emission intensity shows that the

downtown of Medellin represents the area more affected by the vehicular traffic, on-going in importance, the

center-western region of the city. Likewise, for the analyzed area, the biggest emissions were evidenced in

the hours of the day, with marked picks at 8:00 in the morning and 19:00 in the night. Future studies that

involve local emission factors, obtained from own data of the region, become necessary to reach more

representative results to the conditions of vehicular traffic in the Aburrá valley.

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