Author(s)

M. Osses, C. Gherardelli & F. Fresard

Abstract

A model to determine primary air pollutant emissions from urban buses in Santiago de Chile M. Osses% C. Gherardelli* & F. Fresard^ * Department of Mechanical Engineering, University of Chile, Chile ^DICTUC, Pontificia Universidad Catolica, Chile Abstract A methodology for estimating emissions from urban buses using passive traffic data is described. A software simulation of the physical road network and traffic activity is linked to a set of emission factors for estimating emissions of particulate matter (PM), carbon monoxide (CO), unburned hydrocarbons (HC), oxides of nitrogen (NOx), sulphur dioxide (SO]), methane (CHU), nitrous oxide (N]O), ammonia (NHg) and fuel consumption (FC). Observed traffic data is compared to simulated data from a travel demand model, on the metropolitan area of Santiago de Chile. Urban buses are one of the largest sources of primary particulate matter and nitrogen oxides in Santiago. Total fleet reaches 8469 units, divided into three types

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