Remote sensing of Aerosols, Clouds and Trace gases (ReACT) is the Atmospheric Remote Sensing (RS) Research Unit operating under the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS) of the National Observatory of Athens (NOA). ReACT consists of highly motivated scientists within the field of Atmospheric Sciences, combining several Post-doc researchers, Ph.D. and M.Sc. students as well as other research and technical staff, using the resources and infrastructure of IAASARS/NOA.

The scientific mission of ReACT is to promote world-class research towards understanding the Mediterranean climate and the regional processes that lead to extreme weather. More specifically, ReACT utilizes the synergy of ground-based and space-borne remote sensing along with theoretical models to understand the complex aerosol-cloud-radiation interactions that we meet in the Mediterranean environment. 

To achieve its mission, the experimental and theoretical work of ReACT is dedicated to: (a) the development of new atmospheric remote sensing technologies, (b) the operation of observing facilities for continuously monitoring of the atmosphere, (c) the development of new retrievals from ground-based and spaceborne remote sensors, (d) the utilization and improvement of Earth System Models in synergy with observations to study atmospheric processes.