EUCAARI was a EU 6th Framework Programme Integrated Project on aerosol, cloud, climate and air quality interactions
Research chain was utilized as backbone of EUCAARI research. It begins at the molecular scale and extending to the regional and global scale. The scientific approach starts from basic theories of nucleation and chemical processes followed by models of detailed aerosol dynamic/atmospheric chemistry and vegetation–atmosphere exchange, laboratory experiments with continuous field measurements at several research stations, and global-scale modelling. Understanding the highly non-linear processes related to the earth system at different spatial and time scales are crucial in multidisciplinary studies within EUCAARI.