SmogRank / World / The Netherlands / North Holland / October 2026
Most polluted cities in North Holland, The Netherlands, October 2026
2 cities in North Holland, The Netherlands ranked by their average PM2.5 so far (5 of 31 days). Worst: Haarlem at 7.9 µg/m³, #847 of 2,246 cities in the world. Cleanest: Medemblik at 7.8. A city needs measurements on 70% of the days to be ranked.
Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.
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
All cities in the world, October 2026 · All cities in The Netherlands, October 2026 · North Holland now
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SmogRank, most polluted cities in North Holland, The Netherlands, PM2.5, October 2026 (so far), smogrank.com/nl/region/north-holland/history/2026-10 (accessed 6 Oct 2026).
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.