What is the air quality trend in Heiloo?

Over the past 8 days, Heiloo had an average AQI of 33 based on station measurements. The worst day was 2026-08-04 with AQI 77.

How is Heiloo air quality measured?

Air quality in Heiloo 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 Heiloo, Netherlands

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

125h

PM2.5 Station

125h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-08	69	63–73	20.6 µg/m³	22.1	3h	1
2026-08-07	13	1–32	3.0 µg/m³	2.8	22h	2
2026-08-06	14	4–33	3.4 µg/m³	1.8	14h	2
2026-08-05	14	3–46	3.5 µg/m³	1.8	14h	2
2026-08-04	77	34–137	24.5 µg/m³	27.2	21h	1
2026-08-03	44	6–109	12.6 µg/m³	13.2	23h	1
2026-08-02	17	3–63	4.2 µg/m³	4.3	18h	1
2026-08-01	17	3–43	4.1 µg/m³	4.3	10h	1

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