SAMIRA - SAtellite based Monitoring Initiative for Regional Air quality goal is to improve regional and local air quality monitoring through synergetic use of data from present and upcoming satellites, traditionally used in situ air quality monitoring networks and output from chemical transport models. Through collaborative efforts in four countries (Poland, Romania, The Czech Republic, and Norway) with different, but pressing air quality problems, SAMIRA aims to support the selected institutions and associated users in their national monitoring obligations as well as to generate novel research in this area