Worst air pollution Winterthur, today and tomorrow
Today (16 July): Air quality in Winterthur is fair. PM2.5, NO2, and PM1 are fair; AQI and O3 are medium; PM10, SO2, CO, and HCHO are good. Pollution peaks around 2:00 PM (O3: 47.4/100).
Tomorrow (17 July 2026): Air quality in Winterthur is fair. AQI worsens to fair; PM2.5 decreases to good; O3 increases to fair; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 3:00 PM (O3: 36.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Winterthur's air quality is generally good, benefiting from the Swiss Mittelland's position with the Jura hills channelling Atlantic westerlies and the Töss river valley providing natural ventilation. Vehicle traffic on the A1 motorway and the surrounding Sulzer and Georg Fischer industrial engineering operations contribute the primary local sources, while the Alpine Föhn wind periodically delivers exceptional clean mountain air from the south.
Today - 16 July | Pollution peaks at 14:00
AQI:
Medium
47.4/100
PM2.5 (fine particles):
Fair
22.9/100
PM10 (coarse particles):
Good
7.2/100
NO2 (nitrogen dioxide):
Fair
36.7/100
O3 (ozone):
Medium
47.4/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Fair
27.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
36.1/100
PM2.5 (fine particles):
Good
14.0/100
PM10 (coarse particles):
Good
6.3/100
NO2 (nitrogen dioxide):
Fair
35.0/100
O3 (ozone):
Fair
36.1/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
17.8/100
Pollen forecast in Winterthur
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Winterthur
Frequently Asked Questions
Is air quality bad in Winterthur right now?
On 16 July 2026, overall air quality in Winterthur is fair. NO2 is the main pollutant at 36.7/100. Pollution peaks around 2:00 PM (O3: 47.4/100).
Will air quality be worse tomorrow in Winterthur?
On 17 July 2026, air quality conditions in Winterthur will be similar to today, with AQI forecast at fair at 36.1/100. Pollution peaks around 3:00 PM (O3: 36.1/100).
When is air pollution at its worst in Winterthur?
The worst stretch for air quality at Winterthur tends to be a calm winter morning, when vehicle traffic and dense urban activity gather along the lakeshore under a layer of cold, trapped air. Warmer months bring noticeably better airflow around the lake, with only the occasional summer ozone spike breaking an otherwise clean pattern through spring and autumn.
Are air quality levels in Winterthur 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.
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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