Calculation of air pollutant and greenhouse gas emissions for the period March-May 2017-2020 of the Attica Region was take place. Analysis of measurements with regard to the corresponding emissions and meteorological parameters. Moreover, the effects of the pandemic restrictive measures were evaluated. Τhe restrictive measures impact in relation to the emission sources was investigated and their contribution was quantified. Conclusions and proposals on the future evolution of pollution level and compliance with existing limits were presented.