SmogRank / Countries / Belgium / December 2025

Most polluted cities in Belgium, December 2025

37 cities in Belgium ranked by their average PM2.5 over the 31 days. Worst: Izegem at 12.3 µg/m³, #609 of 2,360 cities in the world. Cleanest: Marche-en-Famenne at 5.0. A city needs measurements on 70% of the days to be ranked.

  1. 1IzegemFlanders
    12.3
  2. 2EvergemFlanders
    11.8
  3. 3GrimbergenFlanders
    11.5
  4. 4RoeselareFlanders
    11.4
  5. 5MenenFlanders
    11.2
  6. 6LochristiFlanders
    10.8
  7. 7MaldegemFlanders
    10.3
  8. 7HasseltFlanders
    10.3
  9. 9KapellenFlanders
    10.2
  10. 10KortrijkFlanders
    9.9
  11. 10HouthalenFlanders
    9.9
  12. 12MonsWallonia
    9.8
  13. 12MechelenFlanders
    9.8
  14. 14GentFlanders
    9.7
  15. 14BeverenFlanders
    9.7
  16. 16KoksijdeFlanders
    9.6
  17. 16Knokke-HeistFlanders
    9.6
  18. 18ZwijndrechtFlanders
    9.5
  19. 18WillebroekFlanders
    9.5
  20. 18StabroekFlanders
    9.5
  21. 18AntwerpFlanders
    9.5
  22. 22ZaventemFlanders
    9.4
  23. 22GenkFlanders
    9.4
  24. 24MolFlanders
    8.8
  25. 25BrusselsBrussels Capital
    8.7
  26. 25AarschotFlanders
    8.7
  27. 27TournaiWallonia
    7.8
  28. 28LiègeWallonia
    7.7
  29. 29Flémalle-HauteWallonia
    7.6
  30. 30CharleroiWallonia
    7.3
  31. 31RixensartWallonia
    7.1
  32. 32NamurWallonia
    6.3
  33. 32AnsWallonia
    6.3
  34. 34EupenWallonia
    5.8
  35. 35JumetWallonia
    5.5
  36. 36AndenneWallonia
    5.3
  37. 37Marche-en-FamenneWallonia
    5.0
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 · Belgium now