What is the air quality trend in Heerlen?

Over the past 15 days, Heerlen had an average AQI of 40 based on station measurements. The worst day was 2026-10-19 with AQI 91.

How is Heerlen air quality measured?

Air quality in Heerlen 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 Heerlen, Netherlands

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

335h

PM2.5 Station

335h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	50	21–90	13.9 µg/m³	11h	2
2026-10-20	75	57–115	23.4 µg/m³	24h	2
2026-10-19	91	59–176	32.0 µg/m³	24h	2
2026-10-18	81	30–155	26.8 µg/m³	24h	2
2026-10-17	16	4–47	3.9 µg/m³	24h	2
2026-10-16	27	6–67	6.7 µg/m³	24h	2
2026-10-15	24	5–56	5.8 µg/m³	24h	2
2026-10-14	40	15–67	10.0 µg/m³	24h	2
2026-10-13	14	4–29	3.4 µg/m³	24h	1
2026-10-12	34	4–81	9.0 µg/m³	24h	2
2026-10-11	21	4–52	5.0 µg/m³	24h	2
2026-10-10	24	5–54	5.9 µg/m³	24h	2
2026-10-09	14	4–27	3.2 µg/m³	24h	2
2026-10-08	27	4–191	10.7 µg/m³	24h	2
2026-10-07	66	17–176	24.5 µg/m³	12h	2

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