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 to10 Mar 2026 That day's board

The worst cities in The Netherlands for PM2.5 over the 30 days to 10 Mar 2026: Haarlem 22.5 µg/m³, Schiedam 16.7 µg/m³ and Badhoevedorp 16.4 µg/m³.

  1. 1HaarlemNorth Holland22.5
  2. 2SchiedamSouth Holland16.7
  3. 3BadhoevedorpNorth Holland16.4
  4. 4's-GravenzandeSouth Holland15.2
  5. 5Velsen-ZuidNorth Holland15.0
  6. 6RotterdamSouth Holland15.0
  7. 7RidderkerkSouth Holland14.9
  8. 8The HagueSouth Holland14.7
  9. 9SpijkenisseSouth Holland14.6
  10. 10AmsterdamNorth Holland14.5
  11. 11ZaanstadNorth Holland14.4
  12. 12GroningenGroningen14.4
  13. 13MaassluisSouth Holland14.3
  14. 14LopikUtrecht14.2
  15. 15IJsselsteinUtrecht14.2
  16. 16ZwanenburgNorth Holland14.1
  17. 17UtrechtUtrecht14.1
  18. 18VelserbroekNorth Holland14.1
  19. 19TilburgNorth Brabant14.0
  20. 20MedemblikNorth Holland14.0

+ 17 more cities, 14.0 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.