SmogRank / History / City race

Cities in Belgium, worst air first, day by day

Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.

CountriesCities
The 30 days to18 Mar 2025 That day's board

The worst cities in Belgium for PM2.5 over the 30 days to 18 Mar 2025: Menen 23.4 µg/m³, Roeselare 21.8 µg/m³ and Meulebeke 20.2 µg/m³.

  1. 1MenenFlanders23.4
  2. 2RoeselareFlanders21.8
  3. 3MeulebekeFlanders20.2
  4. 4IzegemFlanders20.2
  5. 5LochristiFlanders19.9
  6. 6VeurneFlanders19.6
  7. 7KoksijdeFlanders19.6
  8. 8HouthalenFlanders19.2
  9. 9ZelzateFlanders19.1
  10. 10KortrijkFlanders18.9
  11. 11GrimbergenFlanders18.8
  12. 12RixensartWallonia18.7
  13. 13GentFlanders18.3
  14. 14ZwijndrechtFlanders17.5
  15. 15StabroekFlanders17.3
  16. 16BeverenFlanders17.1
  17. 17AntwerpFlanders17.1
  18. 18MechelenFlanders17.0
  19. 19ZaventemFlanders16.9
  20. 20MonsWallonia16.3

+ 21 more cities, the next at 16.1 µg/m³

Not counted on this day, too few days measured: Tournai since 18 Mar 2025, Eupen since 13 Mar 2025, Maldegem since 3 Mar 2025 and Damme since 3 Mar 2025.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that day

A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.

Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites. We are building the reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.