IN SITU MEASUREMENTS OF CO AND NOX PUNCTUAL SOURCES FORMED DURING COLD START AND IDLE  ENGINE MODES IN ORAN CITY

Bencherif, Mohamed; Bencherif, Mohamed Menaouar; Rahal, Farid

Communication science et technologie
Volume 20, Numéro 1, Pages 1-8
2022-03-14

In Situ Measurements Of Co And Nox Punctual Sources Formed During Cold Start And Idle Engine Modes In Oran City

Authors : Bencherif Mohamed . Bencherif Mohamed Menaouar . Rahal Farid .

Abstract

Oran, a large economic city in northwestern of Algeria, is nowadays home to a rapidly expanding urban fabric and a diversified infrastructure where socio-economic activity is increased. It distinguishes by the presence of a port, an airport, several industrial zones, several university centers, as well as various commercial and hospital structures. This results in a dense and ramified road network. Because, in Algeria, the car fleet is booming during the last decades, road traffic is one of the main sources of air pollution in Oran. The construction of hoppers, tramway lines, the extension of the city with the displacement of economic activity zones from the city center to the periphery generate a multitude of new data to be considered and updated regularly to analyze pollutant dispersion with the aim to develop cleanup strategies. This article focuses closely on estimating pollutant quantities exhausted by vehicles which are considered to be the main sources. Measurements consist in recording the CO and NOx contents emanating from the exhaust of vehicles during their passage through the plugs during rush hours. An analysis is devoted to pollutants released during cold start engine mode. Particular interest is dedicated to the roundabouts without hoppers of the third ring road as well as to two crossings with traffic lights. The approach is inspired by several previous works on pollutant dispersion in Oran. The estimation of the pollution level is done by adding the number of vehicles per category noted at the points at mentioned times. The measurements are processed and analyzed by vehicle category and by site and correlations are determined. In the aim to a good exploitation of the results, pollutant amounts are expressed as hourly rate flows.