Airborne psychotropic substances in eight Italian big cities: Burdens and behaviours

► Psychotropic substances (PSs) were monitored in eight big Italian cities over one year. ► The site-to-site and year time modulations of PSs were investigated. ► The PSs contents in the air were plotted vs. air toxicants (O3, NO2, PM10, PAHs). ► The relationships among drug modulations and meteo-climatic variables were studied. ► The results were compared to those of previous investigations.