Worst air pollution Herisau, today and tomorrow
Today (16 July): Air quality in Herisau is fair. O3 and PM1 are fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, and HCHO are good. Pollution peaks around 4:00 AM (NO2: 45.4/100).
Tomorrow (17 July 2026): Air quality in Herisau is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 1:00 AM (NO2: 52.4/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Herisau's air quality benefits from its Appenzell foothill position, with vehicle traffic on regional roads the primary local source amid the generally clean, forested pre-Alpine terrain of Appenzell Ausserrhoden.
Today - 16 July | Pollution peaks at 04:00
AQI:
Medium
45.4/100
PM2.5 (fine particles):
Good
17.2/100
PM10 (coarse particles):
Good
6.7/100
NO2 (nitrogen dioxide):
Medium
45.4/100
O3 (ozone):
Fair
39.7/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.3/100
PM1 (ultrafine particles):
Fair
21.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 01:00
AQI:
Medium
52.4/100
PM2.5 (fine particles):
Fair
21.2/100
PM10 (coarse particles):
Good
7.8/100
NO2 (nitrogen dioxide):
Medium
52.4/100
O3 (ozone):
Fair
33.9/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.0/100
PM1 (ultrafine particles):
Fair
23.5/100
Pollen forecast in Herisau
View pollen forecastFrequently Asked Questions
Is air quality bad in Herisau right now?
On 16 July 2026, overall air quality in Herisau is fair. O3 is the main pollutant at 39.7/100. Pollution peaks around 4:00 AM (NO2: 45.4/100).
Will air quality be worse tomorrow in Herisau?
On 17 July 2026, air quality conditions in Herisau will be similar to today, with O3 forecast at fair at 33.9/100. Pollution peaks around 1:00 AM (NO2: 52.4/100).
When is air pollution at its worst in Herisau?
Herisau's poorest air quality tends to show up when winter stillness lets vehicle traffic and light industry build up in the surrounding valley rather than dispersing. Once spring arrives, dispersion improves steadily along the valley floor, and summer stays largely clear except during rare heatwaves; autumn tends to be comparatively mild.
Are air quality levels in Herisau based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Want to see air quality forecasts for other cities in Switzerland?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app