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 to4 Feb 2026 That day's board

The worst cities in The Netherlands for PM2.5 over the 30 days to 4 Feb 2026: Haarlem 35.8 µg/m³, Groningen 23.0 µg/m³ and Medemblik 22.2 µg/m³.

  1. 1HaarlemNorth Holland35.8
  2. 2GroningenGroningen23.0
  3. 3MedemblikNorth Holland22.2
  4. 4Velsen-ZuidNorth Holland21.4
  5. 5BadhoevedorpNorth Holland21.3
  6. 6WormerNorth Holland21.2
  7. 7PurmerendNorth Holland21.2
  8. 8ZwanenburgNorth Holland21.1
  9. 9VelserbroekNorth Holland21.1
  10. 10SchiedamSouth Holland20.7
  11. 11ZaanstadNorth Holland20.2
  12. 12EnschedeOverijssel19.7
  13. 13AmsterdamNorth Holland19.7
  14. 14LopikUtrecht19.5
  15. 15KollumFriesland19.5
  16. 16IJsselsteinUtrecht19.5
  17. 17The HagueSouth Holland19.3
  18. 18RidderkerkSouth Holland19.3
  19. 19's-GravenzandeSouth Holland19.1
  20. 20LunterenGelderland19.0

+ 17 more cities, 19.0 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.