SmogRank / World / Europe / The Netherlands / Utrecht

Most polluted cities in Utrecht, The Netherlands

3 measured cities, this year; 3 above the WHO annual guideline. Worst: Lopik at 9.5 µg/m³, #1,137 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

South Holland: 8 measured citiesFlevolandGelderland: 2 measured citiesNorth Holland: 8 measured citiesUtrecht: 3 measured cities#3 Utrecht: 9.0 µg/m³#2 Breukelen: 9.2 µg/m³#1 Lopik: 9.5 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Lopik 2% 1%0
Every measured city in Utrecht, The Netherlands, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Lopik 2%
  2. 2Breukelen 1%
  3. 3Utrecht 1%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Utrecht 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.

City7-day estimateBand
Amersfoort≈ 11 µg/m³Moderate
Nieuwegein≈ 11 µg/m³Moderate
Veenendaal≈ 11 µg/m³Moderate
Zeist≈ 10 µg/m³Moderate
Woerden≈ 10 µg/m³Moderate
Soest≈ 11 µg/m³Moderate
Maarssen≈ 11 µg/m³Moderate
IJsselstein≈ 11 µg/m³Moderate
Leusden≈ 11 µg/m³Moderate
Baarn≈ 9 µg/m³Moderate
Bilthoven≈ 10 µg/m³Moderate
De Meern≈ 11 µg/m³Moderate
Leerdam≈ 11 µg/m³Moderate
Vianen≈ 11 µg/m³Moderate
Driebergen-Rijsenburg≈ 11 µg/m³Moderate
Rhenen≈ 11 µg/m³Moderate
Wijk bij Duurstede≈ 11 µg/m³Moderate
Mijdrecht≈ 9 µg/m³Good

Bad-air episodes in Utrecht

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

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SmogRank, most polluted cities in Utrecht, The Netherlands, PM2.5, this year to 6 Oct 2026, 23:00 UTC, smogrank.com/nl/region/utrecht?w=year.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.