PM10 pollution episodes associated with emissions and meteorological situations in Istanbul is investigated. The air quality stations in ten urban areas in both Asian and European sides including industrialized Kağıthane creek valley which is at the northeast part of the old city are used in the study. In both Asian and European sides, EU’s daily average PM10 air quality standards were exceeded approximately throughout the year (The current period of PM10 measurements in industrialized creek region is eight months). Besides, in order to account for possible long range transport of particles in Istanbul, the association of the PM10 levels with backwards trajectories was examined.