Cleanest air
µg/m³ PM2.5
Air quality · Bulgaria
Which city had the cleanest air?
Pick a period and compare Sofia, Plovdiv, Varna, Burgas and Ruse by their average PM2.5 concentration, measured by Sensor.Community citizen sensors.
Choose a period
Quick pick:
Ranking
Pick a period to rank the cities
- – Sofia —
- – Plovdiv —
- – Varna —
- – Burgas —
- – Ruse —
Cities
10 km around each centre
How it works
Real measurements
Data comes from the daily archive of Sensor.Community, using outdoor particulate-matter sensors only.
10 km around each centre
A sensor counts towards a city if it is within 10 km of the city centre.
Stored locally
Measurements are downloaded ahead of time, so at least the last 3 months can be queried quickly.
What do the colours mean?
Bands follow the European Air Quality Index for PM2.5 (µg/m³).
- Good 0–10
- Fair 10–20
- Moderate 20–25
- Poor 25–50
- Very poor 50–75
- Extremely poor 75+