| Summary: | Urbanism and mobility strongly constrain present and future environmental conditions in large urban centers. The disorganized expansion of Algerian cities now creates multiple risks related to the transport sector. Air pollution is one of those risks.The objective of this study is to develop a methodology for assessing air pollutant emissions from road traffic. The methodology is based on a coupling between GIS and deterministic modeling to better represent the spatio-temporal distribution of emissions.It is applied to the city of Oran in Algeria, which shows that the growth of the urban fabric, and in particular its peripheral spreading over the period 1966-2015, has led to a transfer of population from the city center to the peripheral poles of Bir El Djir, Es Sénia and Sidi Chahmi. This spread is confirmed by the study of a chronological series of satellite images. This evolution of the urban form generates a greater need for mobility and aggravates the circulation and congestion problems of fossil-fueled vehicles that are sources of significant polluting emissions whose negative impact on health and environment is no longer to prove.The implementation of a pollutant emissions cadastre is an essential step in order to evaluate the air quality in the Oran region. These emissions are here quantified in time and space thanks to the application of the EMISENS model, based on vehicle counts. Given the evolution of the urban fabric and transport, these emissions should continue to increase because of the mobility needs induced by the uninterrupted spread of the city and by the high attractiveness of the city center to the Oran agglomeration citizens.
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