What is the air quality trend in Hämeenlinna?

Over the past 15 days, Hämeenlinna had an average AQI of 10 based on station measurements. The worst day was 2026-10-09 with AQI 18.

How is Hämeenlinna air quality measured?

Air quality in Hämeenlinna 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 Hämeenlinna, Finland

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

Historical PM2.5 and AQI trend from monitoring stations near Hämeenlinna, Finland.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

99h

PM2.5 Station

99h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	18	17–18	4.2 µg/m³	2h	1
2026-10-20	14	9–23	3.4 µg/m³	8h	1
2026-10-19	13	9–29	3.1 µg/m³	6h	1
2026-10-18	8	6–12	1.9 µg/m³	5h	1
2026-10-17	11	3–24	2.5 µg/m³	9h	1
2026-10-16	10	9–12	2.5 µg/m³	5h	1
2026-10-15	16	8–23	3.8 µg/m³	9h	1
2026-10-14	11	8–14	2.7 µg/m³	9h	1
2026-10-13	11	8–15	2.5 µg/m³	5h	1
2026-10-12	7	3–9	1.6 µg/m³	8h	1
2026-10-11	4	3–7	1.0 µg/m³	7h	1
2026-10-10	4	3–7	1.0 µg/m³	6h	1
2026-10-09	18	7–26	4.4 µg/m³	7h	1
2026-10-08	8	4–13	2.0 µg/m³	8h	1
2026-10-07	8	5–14	2.0 µg/m³	5h	1

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