The occurrence of the Covid-19 pandemic provided an opportunity for researchers and technicians around the world to study, qualitatively and quantitatively, the trend in noise levels during the various phases of the phenomenon. As part of the LIFE MONZA project, co-funded by the European Union, 10 smart and innovative sensors were installed in June 2017 to measure noise levels at as many significant locations in the city of Monza (Italy). Even following the conclusion of the project in June 2020, data acquisition continued on a regular basis by the municipality of Monza, following a training activity carried out by the University of Florence (both partners in the LIFE MONZA project together with ISPRA - Italian Institute for Environmental Protection and Research and Vie en.ro.se. Ingegneria). In 2020, an initial work was published on the comparison of noise levels measured by the sensors immediately before the start of the lock-down phase and during it. In the present study, authors propose a comparison with the levels measured in the subsequent phase in order to understand whether the pandemic experience may have generated new acoustic scenarios or whether the overcoming of its most acute phase has brought noise levels back to pre-pandemic ones.