What is the air quality trend in Halden?

Over the past 8 days, Halden had an average AQI of 22 based on station measurements. The worst day was 2026-10-18 with AQI 38.

How is Halden air quality measured?

Air quality in Halden 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 Halden, Norway

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

Historical PM2.5 and AQI trend from monitoring stations near Halden, Norway.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

40h

PM2.5 Station

40h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	11	5–14	2.6 µg/m³	3h	1
2026-10-20	12	10–16	2.9 µg/m³	6h	1
2026-10-19	22	9–44	5.2 µg/m³	6h	1
2026-10-18	38	18–50	9.1 µg/m³	4h	1
2026-10-17	26	4–67	7.0 µg/m³	7h	1
2026-10-16	17	10–26	4.2 µg/m³	3h	1
2026-10-15	31	28–39	7.5 µg/m³	7h	1
2026-10-14	20	7–29	4.9 µg/m³	4h	1

Back to Halden Air Quality