ExpACT focuses on tackling the health impacts of air pollution, a key factor in the exposome. Moreover, air pollution levels and composition are changing, now and in the future, due to several societal transitions. Therefore, we need new technologies and methods for improved air quality monitoring to make interventions more effective, identify sources of pollution, enforce regulations, and involve the community. ExpACT involves collaboration among scientists, businesses, government bodies, and the public to co-create and use these technologies. ExpACTs approach is to make these methods and data widely accessible for making informed decisions on air quality, contributing to healthier societies.