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On-road traffic is an important source of air pollutants in the Distrito Metropolitano de Quito (DMQ). Until today the emissions from this sector in the DMQ were performed mainly using emission factors from the international literature. This paper updates the atmospheric emission inventory from the on-road traffic in the DMQ, taking 2012 as the base year. The best available information of sales statistics and properties of fuels, the composition of the vehicular park, and traffic intensity were used. The emission factors were deduced using the emission records of the Vehicular Technical Control (VTC) from the DMQ. The on-road traffic emits 102.7 kt/y of CO, 20.9 kt/y ofNOx, 13.2 kt/y ofNMVOC, 1.7 kt/y of PM 10 , 1.2 kt/y of PM 2 , 5 and 0.5 kt/y of SO 2 . It was estimated that during 2012, in the DMQ circulated 519 111 vehicles, of which 94.4% correspond to gasoline vehicles and 5.6% to diesel vehicles. The analyses of the VTC’s database shown that 390 326 vehicles were controlled during 2012. The difference in comparison with the estimated vehicle park that actually circulated in the DMQ, indicates that 25% of vehicles not fulfilled the VTC. The gasoline vehicles emit 86.3% of CO, 77.0% ofNMVOC and 75.3% of SO 2 . The diesel vehicles emit 82.5% of PM 2 , 5, 76.4% of PM 1 o and 60.6% of NO x . The information used for this emission inventory implies a reduction in the level of uncertainty in relation to previous emission inventories. Hourly emission maps obtained from this inventory can be used to perform air pollutants chemical transportation studies, using last-generation numerical models.

Inventario de emisiones atmosféricas del tráfico vehicular en el Distrito Metropolitano de Quito. Año base 2012