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The international Commission on Atmospheric Chemistry and Global Pollution (iCACGP also abbreviated CACGP) is one of the Commissions in IAMAS (International Association of Meteorology and Atmospheric Sciences), which in turn is one of the associations within IUGG (International Union of Geodesy and Geophysics) under the non-governmental ICSU (International Council for Science) family. iCACGP supports atmospheric chemistry research that contributes to solving the basic societal issues of water supply, food production and human/ecosystem health. This is done through an enhanced understanding of the fundamental mechanisms that control atmospheric composition and development of improved predictive capabilities. The atmosphere is the integrator of the Earth system. Human emissions of pollutants and long-lived greenhouse gases into the atmosphere have caused dramatic transformations of the planet, altering air quality, climate and nutrient flows in every ecosystem. Understanding the global atmosphere requires an international network of scientists providing intellectual leadership in areas of atmospheric chemistry that need to be addressed, promoted and would benefit from research across disciplines and geographical boundaries. Acknowledgement of this need led to the formation of the International Global Atmospheric Chemistry (IGAC) Project in 1990. IGAC’s mission is to facilitate atmospheric chemistry research towards a sustainable world. This is achieved through IGAC’s three focal activities: fostering community, building capacity, and providing leadership.