What is the air quality in Sofia?

Sofia, Bulgaria has an annual US AQI of 81 (Polluted) and average PM2.5 of 25.4 µg/m³, ranking #3868 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Sofia?

May is typically the cleanest month (AQI 60) and January the most polluted (AQI 124).

Where does Sofia's air quality data come from?

PM2.5: 1998–2026 (monitors 2009–2026, satellite 1998–2008, 2018–2022; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Sofia, Bulgaria — Air Quality & Clean City Guide 2026

Sofia Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3868	Sofia, Bulgaria	Europe	AQI 81	PM2.5 25.4 µg/m³