Spatial variability of fine particles in Parisian streets

International audienceTo study the spatial variability of airborne particles and to evaluate the personal and tourist exposure to fine particles in Paris, measurements of fine particles (PM2.5) concentrations have been made in Parisian streets in different mode of transport (bus, bike and walking), using a portable sensor. We use also meteorological parameters sensor (temperature,humidity and wind speed), a camera to view traffic and a GPS to compare with particles levels. PM2.5 levels are highly variable depending on emission sources (traffic road, work building and natural sources in park). Wind speed and PM2.5 concentrations vary according to urban morphology: wind speed and concentrations are higher in streets canyon than in open spaces. Fine particles (particles