RT Journal Article SR Electronic T1 Is atmospheric pollution exposure during pregnancy associated with individual and contextual characteristics? A nationwide study in France JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 1026 OP 1036 DO 10.1136/jech-2016-208674 VO 71 IS 10 A1 Ouidir, Marion A1 Lepeule, Johanna A1 Siroux, Valérie A1 Malherbe, Laure A1 Meleux, Frederik A1 Rivière, Emmanuel A1 Launay, Ludivine A1 Zaros, Cécile A1 Cheminat, Marie A1 Charles, Marie-Aline A1 Slama, Rémy YR 2017 UL http://jech.bmj.com/content/71/10/1026.abstract AB Background Exposure to atmospheric pollutants is a danger for the health of pregnant mother and children. Our objective was to identify individual (socioeconomic and behavioural) and contextual factors associated with atmospheric pollution pregnancy exposure at the nationwide level.Method Among 14 921 women from the French nationwide ELFE (French Longitudinal Study of Children) mother-child cohort recruited in 2011, outdoor exposure levels of PM2.5, PM10 (particulate matter <2.5 µm and <10 µm in diameter) and NO2 (nitrogen dioxide) were estimated at the pregnancy home address from a dispersion model with 1 km resolution. We used classification and regression trees (CART) and linear regression to characterise the association of atmospheric pollutants with individual (maternal age, body mass index, parity, education level, relationship status, smoking status) and contextual (European Deprivation Index, urbanisation level) factors.Results Patterns of associations were globally similar across pollutants. For the CART approach, the highest tertile of exposure included mainly women not in a relationship living in urban and socially deprived areas, with lower education level. Linear regression models identified different determinants of atmospheric pollutants exposure according to the residential urbanisation level. In urban areas, atmospheric pollutants exposure increased with social deprivation, while in rural areas a U-shaped relationship was observed.Conclusion We highlighted social inequalities in atmospheric pollutants exposure according to contextual characteristics such as urbanisation level and social deprivation and also according to individual characteristics such as education, being in a relationship and smoking status. In French urban areas, pregnant women from the most deprived neighbourhoods were those most exposed to health-threatening atmospheric pollutants.