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.
The worst cities in The Netherlands for PM2.5 over the 30 days to 6 Dec 2025: Haarlem 16.4 µg/m³, Schiedam 11.1 µg/m³ and Groningen 10.1 µg/m³.
- 1HaarlemNorth Holland16.4
- 2SchiedamSouth Holland11.1
- 3GroningenGroningen10.1
- 4VenloLimburg9.8
- 5BadhoevedorpNorth Holland9.8
- 6Velsen-ZuidNorth Holland9.7
- 7EnschedeOverijssel9.5
- 8UtrechtUtrecht9.4
- 9LunterenGelderland9.0
- 10BarneveldGelderland9.0
- 11BredaNorth Brabant8.9
- 12RotterdamSouth Holland8.8
- 13ZwanenburgNorth Holland8.7
- 14VelserbroekNorth Holland8.7
- 15VenrayLimburg8.6
- 16RidderkerkSouth Holland8.6
- 17NijmegenGelderland8.4
- 18AmsterdamNorth Holland8.1
- 19SpijkenisseSouth Holland8.0
- 20ZaanstadNorth Holland7.7
+ 11 more cities, 7.7 µg/m³ and below
Not counted on this day, too few days measured: Waalre since 2 Dec 2025, Tilburg since 2 Dec 2025, Eindhoven since 2 Dec 2025 and 3 more cities.
Cities counted each 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.