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                <term xml:lang="fr">BOUCLES ELECTROMAGNETIQUES</term>
                <term xml:lang="fr">VEHICULES TRACEURS</term>
                <term xml:lang="fr">ECHANTILLONNAGE</term>
                <term xml:lang="fr">EMISSION POLLUANT</term>
                <term xml:lang="fr">TRAFIC ROUTIER</term>
                <term xml:lang="fr">CIRCULATION ROUTIERE</term>
                <term xml:lang="fr">MILIEU URBAIN</term>
                <term xml:lang="fr">ESTIMATION</term>
                <term xml:lang="fr">BOUCLE ELECTROMAGNETIQUE</term>
                <term xml:lang="fr">VEHICULE TRACEUR</term>
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              <p>This paper investigates the sensibility of pollutant estimations to errors when determining the traffic states at large urban scale. Two key figures are required to estimate traffic-related pollutants at this scale: the mean speed with the considered region and the travel production. Loop detectors and probes can be used to determine these variables. In this paper, the estimation methods for these variables and the influence of the sampling rate will be questioned. The analysis revealed that (i) probes data provide accurate results even for low sampling rate and that (ii) the precision of travel production's estimate is mainly linked to the precision of the sampling ratio's assessment. The latter will be approximated combining information from probes and loops.</p>
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              <p>Cet article examine la sensibilité des estimations de polluants aux erreurs lors de la détermination des états de circulation à grande échelle en milieu urbain. Deux chiffres clés sont nécessaires pour estimer les polluants liés au trafic à cette échelle : la vitesse moyenne avec la région considérée et la production de déplacements. Des boucles de comptages et des véhicules traceurs peuvent être utilisés pour déterminer ces variables. Dans cet article, les méthodes d'estimation de ces variables et l'influence du taux d'échantillonnage seront remises en question. L'analyse a révélé que (i) les données des véhicules traceurs fournissent des résultats précis même pour un faible taux d'échantillonnage et que (ii) la précision de l'estimation de la production de déplacements est principalement liée à la précision de l'évaluation du taux d'échantillonnage. Ce dernier sera approximé en combinant les informations des véhicules traceurs et des boucles de comptages.</p>
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