SmogRank / World / Europe / The Netherlands / South Holland

Most polluted cities in South Holland, The Netherlands

8 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Schiedam at 8.1 µg/m³, #964 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.

ZeelandSouth Holland: 8 measured citiesFlevolandGelderland: 2 measured citiesNorth Brabant: 3 measured citiesNorth Holland: 7 measured citiesUtrecht: 3 measured cities#8 Noordwijkerhout: 5.9 µg/m³#7 Maassluis: 6.4 µg/m³#6 The Hague: 7.0 µg/m³#5 's-Gravenzande: 7.3 µg/m³#4 Spijkenisse: 7.4 µg/m³#2 Rotterdam: 7.6 µg/m³#3 Ridderkerk: 7.6 µg/m³#1 Schiedam: 8.1 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Schiedam 0% 0.75%0
Every measured city in South Holland, 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. 1Schiedam 0%
  2. 2Rotterdam 0%
  3. 2Ridderkerk 0%
  4. 4Spijkenisse 0%
  5. 5's-Gravenzande 0%
  6. 6The Hague 0%
  7. 7Maassluislast full day 2 Oct 0%
  8. 8Noordwijkerhout 0%
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

South 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.

City7-day estimateBand
Leiden≈ 9 µg/m³Moderate
Dordrecht≈ 10 µg/m³Moderate
Zoetermeer≈ 9 µg/m³Moderate
Delft≈ 9 µg/m³Good
Vlaardingen≈ 9 µg/m³Moderate
Gouda≈ 10 µg/m³Moderate
Alphen aan den Rijn≈ 10 µg/m³Moderate
Capelle aan den IJssel≈ 9 µg/m³Moderate
Rijswijk≈ 9 µg/m³Moderate
Zwijndrecht≈ 10 µg/m³Moderate
Barendrecht≈ 9 µg/m³Moderate
Voorburg≈ 9 µg/m³Moderate
Hoogvliet≈ 9 µg/m³Moderate
Gorinchem≈ 10 µg/m³Moderate
Papendrecht≈ 10 µg/m³Moderate
Ypenburg≈ 9 µg/m³Moderate
Krimpen aan den IJssel≈ 10 µg/m³Moderate
Leiderdorp≈ 9 µg/m³Moderate
Wassenaar≈ 9 µg/m³Moderate
Waddinxveen≈ 10 µg/m³Moderate
Noordwijk-Binnen≈ 8 µg/m³Good
Sliedrecht≈ 10 µg/m³Moderate
Oud-Beijerland≈ 9 µg/m³Moderate
Scheveningen≈ 9 µg/m³Moderate
Voorschoten≈ 9 µg/m³Moderate
Lisse≈ 8 µg/m³Good
Hellevoetsluis≈ 8 µg/m³Good
Oegstgeest≈ 9 µg/m³Moderate
Hendrik-Ido-Ambacht≈ 10 µg/m³Moderate
Berkel en Rodenrijs≈ 9 µg/m³Moderate
Katwijk aan Zee≈ 8 µg/m³Good
Bodegraven≈ 10 µg/m³Moderate
Nootdorp≈ 9 µg/m³Moderate
Benthuizen≈ 9 µg/m³Moderate
Pijnacker≈ 9 µg/m³Moderate
Hillegom≈ 8 µg/m³Good
Alblasserdam≈ 10 µg/m³Moderate
Rhoon≈ 9 µg/m³Moderate
Naaldwijk≈ 9 µg/m³Moderate
Middelharnis≈ 8 µg/m³Good

Bad-air episodes in South Holland

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

Use this board

SmogRank, most polluted cities in South Holland, The Netherlands, PM2.5, last 30 days to 7 Oct 2026, 00:00 UTC, smogrank.com/nl/region/south-holland?w=30d.

Download top 10 (PNG)

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 2026-10-07 00:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.