What is the air quality trend in Horten?

Over the past 21 days, Horten had an average AQI of 23 based on station measurements. The worst day was 2026-08-29 with AQI 40.

How is Horten air quality measured?

Air quality in Horten 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 Horten, Norway

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

341h

PM2.5 Station

341h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	11	8–15	2.6 µg/m³	10h	2
2026-09-04	17	7–33	4.1 µg/m³	16h	2
2026-09-03	22	6–63	5.5 µg/m³	20h	2
2026-09-02	30	6–77	7.5 µg/m³	15h	2
2026-09-01	37	10–52	9.0 µg/m³	19h	2
2026-08-31	38	14–73	9.3 µg/m³	18h	2
2026-08-30	24	13–37	5.8 µg/m³	20h	2
2026-08-29	40	20–74	10.0 µg/m³	19h	2
2026-08-28	39	28–52	9.3 µg/m³	22h	2
2026-08-27	38	28–61	9.2 µg/m³	20h	2
2026-08-26	30	21–84	7.7 µg/m³	22h	2
2026-08-25	23	11–76	5.7 µg/m³	22h	2
2026-08-24	14	8–25	3.4 µg/m³	20h	2
2026-08-23	7	5–10	1.7 µg/m³	8h	1
2026-08-22	8	4–18	1.9 µg/m³	14h	2
2026-08-21	30	20–50	7.3 µg/m³	13h	1
2026-08-20	32	16–64	8.0 µg/m³	13h	1
2026-08-19	20	13–29	4.7 µg/m³	15h	1
2026-08-18	12	6–28	2.8 µg/m³	15h	2
2026-08-17	11	7–15	2.5 µg/m³	17h	1
2026-08-16	13	11–17	3.1 µg/m³	3h	2

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