Document Detail

Validity of a traffic air pollutant dispersion model to assess exposure to fine particles.
MedLine Citation:
PMID:  19545865     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: Fine particles (PM(2.5)) are an important component of air pollution. Epidemiological studies have shown health effects due to ambient air particles, particularly allergies in children. Since the main difficulty is to determine exposure to such pollution, traffic air pollutant (TAP) dispersions models have been developed to improve the estimation of individual exposure levels. One such model, the ExTra index, has been validated for nitrogen oxide concentrations but not for other pollutants. The purpose of this study was to assess the validity of the ExTra index to assess PM(2.5) exposure. METHODS: We compared PM(2.5) concentrations calculated by the ExTra index to reference measures (passive samplers situated under the covered part of the playground), in 15 schools in Bordeaux, in 2000. First, we collected the input data required by the ExTra index: background and local pollution depending on traffic, meteorology and topography. Second, the ExTra index was calculated for each school. Statistical analysis consisted of a graphic description; then, we calculated an intraclass correlation coefficient. RESULTS: Concentrations calculated with the ExTra index and the reference method were similar. The ExTra index underestimated exposure by 2.2 microg m(-3) on average compared to the reference method. The intraclass correlation coefficient was 0.85 and its 95% confidence interval was [0.62; 0.95]. CONCLUSIONS: The results suggest that the ExTra index provides an assessment of PM(2.5) exposure similar to that of the reference method. Although caution is required in interpreting these results owing to the small number of sites, the ExTra index could be a useful epidemiological tool for reconstructing individual exposure, an important challenge in epidemiology.
Aude Kostrzewa; Patrice Reungoat; Chantal Raherison
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental research     Volume:  109     ISSN:  1096-0953     ISO Abbreviation:  Environ. Res.     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-07-06     Completed Date:  2009-07-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0147621     Medline TA:  Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  651-6     Citation Subset:  IM    
Laboratoire Santé Travail Environnement (LSTE), EA 3672, ISPED-Université Victor Segalen Bordeaux 2, Case 11, 146 Rue Léo Saignat, 33076 Bordeaux Cedex, France.
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MeSH Terms
Air Pollutants / analysis*
Data Interpretation, Statistical
Environmental Monitoring / methods*,  statistics & numerical data
Inhalation Exposure / analysis*
Models, Theoretical*
Particle Size
Particulate Matter / analysis*
Reproducibility of Results
Research Design
Schools / standards
Reg. No./Substance:
0/Air Pollutants; 0/Particulate Matter

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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