The project objectives are:demonstrate how Service Tools from atmospheric Research Infrastructures (RIs) can be enhanced to better address the challenges and societal needs concerning air quality (AQ) in European cities and industrial hotspots; respond to the urgent needs to reduce air pollution across EU by providing enhanced AQ observations in support of advanced AQ policy assessment; develop and enhance synergies between AQ Monitoring Networks and atmospheric RIs combining advanced science knowledge and innovative technologies to develop pilot STs.