What is the air quality trend in Hillegom?

Over the past 8 days, Hillegom had an average AQI of 42 based on station measurements. The worst day was 2026-05-23 with AQI 77.

How is Hillegom air quality measured?

Air quality in Hillegom 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 Hillegom, Netherlands

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	56	5–123	17.9 µg/m³	21.3	20h	2
2026-05-28	8	1–21	1.6 µg/m³	2.6	22h	2
2026-05-27	21	3–94	6.0 µg/m³	7.3	24h	2
2026-05-26	39	11–120	11.1 µg/m³	13.1	24h	3
2026-05-25	18	3–34	4.4 µg/m³	5.1	24h	2
2026-05-24	59	10–128	18.9 µg/m³	22.4	24h	2
2026-05-23	77	24–145	25.6 µg/m³	29.7	24h	3
2026-05-22	61	50–72	17.0 µg/m³	18.3	4h	3

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