Title: Validation of the ExTra index in Grenoble

Authors: Patrice Reungoat, Mireille Chiron, Yvon Le Moullec, Stephanie Gauvin, Denis Zmirou, Jean-Paul Flori, Isabelle Momas

Addresses: Lab. ''Hygiene et Sante Publique'', Univ. Paris, V, 4 Av de l'Observatoire, 75006 Paris, France. Unite Mixte de Recherche Epidemiologique Transport Travail Environnement, INRETS, 25 Avenue Francois Mitterrand, 69675 Bron Cedex, France. Lab. d'Hygiene de la Ville de Paris, 11 Rue George Eastman, 75013 Paris, France. Dep. de Sante Publique, Faculte de Medecine de Grenoble, Domaine de la Merci, 38706 La Tronche Cedex, France. Dep. de Sante Publique, Faculte de Medecine de Grenoble, Domaine de la Merci, 38706 La Tronche Cedex, France. Service Aerodynamique et Environnement climatique du CSTB, 11 rue Henri Picherit, 44071 Nantes Cedex 03, France. Lab. ''Hygiene et Sante Publique'', Univ. Paris, V, 4 Av de l'Observatoire, 75006 Paris, France

Abstract: The ExTra index evaluates ambient concentrations of transport-related pollutants outside the work and living places of urban dwellers. This study contributes to the validation of the ExTra index in Grenoble by comparing ambient concentrations of nitrogen oxides (NOxx) measured over 6 weeks with passive samplers, and of calculated concentrations using the ExTra index, taking into account traffic density, topographical parameters (building height, road and pavement width), weather conditions (wind direction and strength), and background pollution levels. Comparing the measured values and the index calculation in Grenoble indicated a highly significant correlation (0.84) and a good intra-class correlation coefficient (0.80) between the two series of values, which were not significantly different on average. These results suggest that this model could be a useful epidemiological tool to classify city-dwellers according to their present, or even cumulative, exposure to automobile air pollution.

Keywords: motor vehicle related pollution; exposure index; validation; nitrogen oxides.

DOI: 10.1504/IJVD.2001.001972

International Journal of Vehicle Design, 2001 Vol.27 No.1/2/3/4, pp.286-295

Available online: 14 Dec 2003 *

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