Air Quality Lab — Sofia, Bulgaria
Air Quality Profile
Sofia reports an annual PM2.5 of 17.0 µg/m³. That's meaningfully above the WHO 2021 guideline of 5 µg/m³ yet within the EU annual limit of 25 µg/m³.
Sofia
Bulgaria
BulgariaAnnual Average
ModerateWHO annual classification
17.0µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
2121 µg/m³ — Moderate
2222 µg/m³ — Moderate
1717 µg/m³ — Moderate
1313 µg/m³ — Fair
1313 µg/m³ — Fair
1212 µg/m³ — Fair
1414 µg/m³ — Fair
1414 µg/m³ — Fair
1414 µg/m³ — Fair
1818 µg/m³ — Moderate
2222 µg/m³ — Moderate
2424 µg/m³ — Moderate
Jan
Feb
Mar
Apr
May
Jun
2121 µg/m³ — Moderate
2222 µg/m³ — Moderate
1717 µg/m³ — Moderate
1313 µg/m³ — Fair
1313 µg/m³ — Fair
1212 µg/m³ — Fair
Jul
Aug
Sep
Oct
Nov
Dec
1414 µg/m³ — Fair
1414 µg/m³ — Fair
1414 µg/m³ — Fair
1818 µg/m³ — Moderate
2222 µg/m³ — Moderate
2424 µg/m³ — Moderate
Best months: Apr–JunWorst months: Feb, Nov–Dec
Fair10–15 µg/m³Moderate15–25 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Bulgaria
Sofia: 17.0 µg/m³. Typical range in Bulgaria: 14.1–16.4 µg/m³. Low anchor: Karlovo, 12.9 µg/m³. High anchor: Plovdiv, 17.5 µg/m³.
55 cities tracked