SmogRank / World / The Netherlands / North Holland / April 2025

Most unhealthy days in North Holland, The Netherlands, April 2025

6 cities in North Holland, The Netherlands ranked by their share of unhealthy days over the 30 days. The most unhealthy days: Badhoevedorp, The Netherlands, 0 of 24 measured days. A city needs measurements on 70% of the days to be ranked.

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.

← Badhoevedorp 0% 0.75%0
Every city in North Holland, The Netherlands ranked for April 2025, 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. 1Badhoevedorp
    0 of 24
  2. 2Velsen-Zuid
    0 of 25
  3. 3Zwanenburg
    0 of 25
  4. 4Amsterdam
    0 of 26
  5. 5Medemblik
    0 of 30
  6. 6Zaanstad
    0 of 25
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

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SmogRank, most polluted cities in North Holland, The Netherlands, by unhealthy days, PM2.5, April 2025, smogrank.com/nl/region/north-holland/history/2025-04?by=days (accessed 7 Oct 2026).

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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.