What is the air quality trend in Haarlem?

Over the past 2 days, Haarlem had an average AQI of 37 based on station measurements. The worst day was with AQI .

How is Haarlem air quality measured?

Air quality in Haarlem is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Haarlem, Netherlands

Name: Haarlem Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Haarlem, Netherlands.

Current AQI
Good

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

39h · 10 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-10	18	6–26	4.2 µg/m³	11.3	22h	8
2026-04-09	56	10–80	15.9 µg/m³	26.5	17h	11

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