SmogRank / History / City race

Cities in The Netherlands, 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 to8 Feb 2026 That day's board

The worst cities in The Netherlands for PM2.5 over the 30 days to 8 Feb 2026: Haarlem 38.5 µg/m³, Groningen 24.9 µg/m³ and Medemblik 24.4 µg/m³.

  1. 1HaarlemNorth Holland38.5
  2. 2GroningenGroningen24.9
  3. 3MedemblikNorth Holland24.4
  4. 4Velsen-ZuidNorth Holland23.1
  5. 5WormerNorth Holland22.9
  6. 6PurmerendNorth Holland22.9
  7. 7BadhoevedorpNorth Holland22.9
  8. 8ZwanenburgNorth Holland22.8
  9. 9VelserbroekNorth Holland22.8
  10. 10ZaanstadNorth Holland22.0
  11. 11SchiedamSouth Holland21.6
  12. 12KollumFriesland21.4
  13. 13EnschedeOverijssel21.4
  14. 14AmsterdamNorth Holland21.3
  15. 15LunterenGelderland21.0
  16. 16LopikUtrecht21.0
  17. 17IJsselsteinUtrecht21.0
  18. 18BarneveldGelderland21.0
  19. 19The HagueSouth Holland20.8
  20. 20UtrechtUtrecht20.7

+ 17 more cities, 20.7 µg/m³ and below

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 readers for them. Most cities there are missing from this board, not clean. Why.