What is the air quality trend in Herisau?

Over the past 14 days, Herisau had an average AQI of 30 based on station measurements. The worst day was 2026-05-27 with AQI 48.

How is Herisau air quality measured?

Air quality in Herisau 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 Herisau, Switzerland

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

Historical PM2.5 and AQI trend from monitoring stations near Herisau, Switzerland.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 2 stations

Temperature GFS model

55pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	30	4–53	7.3 µg/m³	8.8	24h	4
2026-05-28	33	24–44	7.9 µg/m³	10.4	23h	6
2026-05-27	48	29–65	11.9 µg/m³	18.7	24h	5
2026-05-26	45	27–64	11.0 µg/m³	18.1	24h	6
2026-05-25	36	23–50	8.7 µg/m³	14.2	24h	5
2026-05-24	32	24–48	7.7 µg/m³	7.2	24h	5
2026-05-23	29	10–53	7.1 µg/m³	5.4	24h	6
2026-05-22	24	12–40	5.8 µg/m³	3.3	24h	5
2026-05-21	23	16–31	5.6 µg/m³	3.3	24h	5
2026-05-20	25	11–46	6.0 µg/m³	4.2	24h	5
2026-05-19	25	6–55	6.0 µg/m³	3.8	24h	5
2026-05-18	26	13–46	6.3 µg/m³	4.8	24h	4
2026-05-17	23	9–55	5.5 µg/m³	2.4	24h	4
2026-05-16	24	4–43	5.7 µg/m³	3.9	23h	4

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