ACTRIS-FR is the French component of ACTRIS for the observation and exploration of aerosols, clouds, and reactive gases and their interactions. ACTRIS is a distributed European research infrastructure supporting research on climate and air quality. It improves our understanding of the evolution of atmospheric processes and composition. ACTRIS provides users with high-quality 4-D variability information for short-lived species, sourced from observation and exploration platforms. ACTRIS operates central platforms (data and calibration centers) and provides services to a broad community of users working on chemistry/climate models, satellite data validation, and weather and air quality forecast analysis. Finally, ACTRIS offers physical and remote access to its platforms for the benefit of the scientific community and the private sector, thereby fostering research, training, and technological innovation.