The International Global Atmospheric Chemistry (IGAC) Project was formed in 1990 to address growing international concern over rapid changes observed in EarthA˘a‚¬a„˘s atmosphere. IGAC operates under the umbrella of the International Geosphere Biosphere Programme (IGBP) and is jointly sponsored by the international Commission on Atmospheric Chemistry and Global Pollution (iCACGP). IGAC coordinates and fosters atmospheric chemistry research towards a sustainable worldA‚A by facilitating international collaboration of atmospheric chemistry and multi-disciplinary research, coordinating the synthesis, assessment, and summary of research, cultivating the next generation of atmospheric chemist, and acting as the liaison between the atmospheric chemistry community and the broader Earth System Sustainability community. Although IGAC does not conduct or fund research directly, it does provide an internationally recognized A˘a‚¬A“added valueA˘a‚¬Ať to atmospheric chemistry research. IGAC aims to act as the hub of international atmospheric chemistry research and to share the communitiesA˘a‚¬a„˘ science with individuals, policy makers, stakeholders, and countries across the globe in order to inform individual and societal decisions that lead towards a sustainable world.