Cleaner air in Europe for 20 years, but it's not enough - Terra e Poli. Northern Italy, in particular, is among the regions with the highest concentrations.
Despite the overall improvements, 86% of the European population has experienced at least one day a year with exceedances for two or more pollutants. The most frequent combinations are PM2.5 with nitrogen dioxide and PM2,5 with ozone. According to the study's first author, Zhao-Yue Chen, "Targeted efforts are needed to address PM2 and ozone levels and associated pollution days"