Average PM2.5 concentrations in the least polluted cities in Europe 2021-2022
Faro, the capital of Portugal's Algarve region, was the least polluted city in Europe based on levels measured in 2021 and 2022. With an average PM2.5 concentration of 3.7 micrograms per cubic meter of air (µg/m3), Faro's air quality was almost eight times cleaner than in Europe's most polluted city.