*2.3. Air Pollution*

Annual average ambient concentrations of NO2, PM10, and PM2.5 were modeled at census block level by the local air quality monitoring networks, corresponding to the Ile de France region for two different periods: from January 2004 to December 2009 for NO2 and from January 2007 to December 2009 for PM10 and PM2.5. The ESMERALDA Atmospheric Modeling system was used. This model integrates several data sources: meteorological data, linear emission sources, surface and major point sources, and background pollution measurements.
