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 to11 Feb 2026 That day's board

The worst cities in The Netherlands for PM2.5 over the 30 days to 11 Feb 2026: Haarlem 39.5 µg/m³, Groningen 25.4 µg/m³ and Medemblik 24.7 µg/m³.

  1. 1HaarlemNorth Holland39.5
  2. 2GroningenGroningen25.4
  3. 3MedemblikNorth Holland24.7
  4. 4Velsen-ZuidNorth Holland23.5
  5. 5BadhoevedorpNorth Holland23.3
  6. 6WormerNorth Holland23.2
  7. 7PurmerendNorth Holland23.2
  8. 8ZwanenburgNorth Holland23.1
  9. 9VelserbroekNorth Holland23.1
  10. 10ZaanstadNorth Holland22.7
  11. 11KollumFriesland22.0
  12. 12AmsterdamNorth Holland21.8
  13. 13SchiedamSouth Holland21.6
  14. 14LunterenGelderland21.1
  15. 15EnschedeOverijssel21.1
  16. 16BarneveldGelderland21.1
  17. 17LopikUtrecht21.0
  18. 18IJsselsteinUtrecht21.0
  19. 19The HagueSouth Holland20.9
  20. 20's-GravenzandeSouth Holland20.8

+ 17 more cities, 20.8 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.