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Urban emissions from mobile sources collected by on-board measuring systems are characterized using a new concept, which consists of assigning proper “emissivity” factors to roadway segments in this paper. These factors consider road transport emissions not only as a consequence of vehicles alone, but also, to some extent, of the road segment itself. Within bottom-up models, the on-road measurement is probably the most realistic approach, particularly when compared to the classical dynamometer testing, because the vehicle is measured as it travels in a given roadway. However, the principal drawback is the difficulty in handling the data gathered by the measurements and to properly incorporate it to an emission model. As the roads are characterized here as emitters, a robust description of the distribution of emissions at a spatial and temporal level is possible, contributing to obtaining more accurate representations of ambient conditions at a micro scale, its temporal variability and compliance to air quality standards. The paper presents the experimental results in the city of Mendoza, Argentina, as well as a basis to derive grid emission models for mobile sources using the previously introduced concepts.

Modelling mobile source emissions by on-board characterization of roadways