SmogRank / Countries / Romania / December 2025

Most polluted cities in Romania, December 2025

10 cities in Romania ranked by their average PM2.5 over the 31 days. Worst: Târgu Mureş at 51.4 µg/m³, #157 of 2,360 cities in the world. Cleanest: Calafat at 17.2. A city needs measurements on 70% of the days to be ranked.

  1. 1Târgu Mureşlow-cost sensorsMureș County
    51.4
  2. 2DejCluj County
    31.3
  3. 3Cluj-NapocaCluj County
    23.6
  4. 4VoluntariIlfov
    22.6
  5. 5BufteaIlfov
    20.2
  6. 6CraiovaDolj
    20.0
  7. 7IaşiIași County
    17.9
  8. 8Popeşti-LeordeniIlfov
    17.7
  9. 9BucharestBucharest
    17.3
  10. 10CalafatDolj
    17.2
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, December 2025 · Romania now