SmogRank / Countries / The Netherlands / North Holland
Most polluted cities in North Holland, The Netherlands
8 measured cities, last 7 days; 0 above the WHO 24-hour guideline. Worst: Haarlem at 11.8 µg/m³, #366 in the world.
3 good 5 moderate
- 1Haarlemlow-cost sensors 11.8
- 2Medemblik 10.2
- 3Amsterdam 10.1
- 4Velserbroek 9.8
- 5Zaanstad 9.3
- 6Badhoevedorp 8.0
- 7Velsen-Zuid 7.7
- 8Purmerend 7.1
Estimated: cities without a monitor
North Holland cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Hoofddorp | ≈ 10 µg/m³ |
| Alkmaar | ≈ 9 µg/m³ |
| Hilversum | ≈ 10 µg/m³ |
| Amstelveen | ≈ 10 µg/m³ |
| Zaandam | ≈ 10 µg/m³ |
| Hoorn | ≈ 9 µg/m³ |
| Den Helder | ≈ 9 µg/m³ |
| Heerhugowaard | ≈ 9 µg/m³ |
| Huizen | ≈ 10 µg/m³ |
| Heemskerk | ≈ 10 µg/m³ |
| Beverwijk | ≈ 10 µg/m³ |
| Castricum | ≈ 10 µg/m³ |
| IJmuiden | ≈ 10 µg/m³ |
| Nieuw-Vennep | ≈ 10 µg/m³ |
| Bussum | ≈ 10 µg/m³ |
| Bergen | ≈ 9 µg/m³ |
| Uithoorn | ≈ 10 µg/m³ |
| Heemstede | ≈ 10 µg/m³ |
| Diemen | ≈ 10 µg/m³ |
| Assendelft | ≈ 10 µg/m³ |
| Heiloo | ≈ 9 µg/m³ |
| Aalsmeer | ≈ 10 µg/m³ |
| Volendam | ≈ 10 µg/m³ |
| Schagen | ≈ 9 µg/m³ |
| Weesp | ≈ 10 µg/m³ |
| Enkhuizen | ≈ 9 µg/m³ |
| Krommenie | ≈ 10 µg/m³ |
| Naarden | ≈ 10 µg/m³ |
| Zandvoort | ≈ 9 µg/m³ |
| Julianadorp | ≈ 9 µg/m³ |
Updated 2026-10-01 18:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.