Worst air pollution Chiasso, today and tomorrow
Today (16 July): Air quality in Chiasso is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 PM (O3: 58.2/100).
Tomorrow (17 July 2026): Air quality in Chiasso is fair. HCHO increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 5:00 PM (O3: 49.9/100). 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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Chiasso's air quality reflects its position as Switzerland's main southern border crossing, with intense freight and commuter traffic from Italy contributing significantly elevated local NOx and PM2.5 levels.
Today - 16 July | Pollution peaks at 18:00
AQI:
Medium
58.2/100
PM2.5 (fine particles):
Good
14.2/100
PM10 (coarse particles):
Good
5.5/100
NO2 (nitrogen dioxide):
Fair
35.1/100
O3 (ozone):
Medium
58.2/100
SO2 (sulfur dioxide):
Good
3.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.5/100
PM1 (ultrafine particles):
Good
16.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 17:00
AQI:
Medium
49.9/100
PM2.5 (fine particles):
Good
18.3/100
PM10 (coarse particles):
Good
7.5/100
NO2 (nitrogen dioxide):
Fair
33.9/100
O3 (ozone):
Medium
49.9/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
20.1/100
PM1 (ultrafine particles):
Fair
20.9/100
Pollen forecast in Chiasso
View pollen forecastFrequently Asked Questions
Is air quality bad in Chiasso right now?
On 16 July 2026, overall air quality in Chiasso is fair. NO2 is the main pollutant at 35.1/100. Pollution peaks around 6:00 PM (O3: 58.2/100).
Will air quality be worse tomorrow in Chiasso?
On 17 July 2026, air quality conditions in Chiasso will be similar to today, with NO2 forecast at fair at 33.9/100. Pollution peaks around 5:00 PM (O3: 49.9/100).
When is air pollution at its worst in Chiasso?
On a still winter morning, vehicle traffic and tourism at Chiasso linger in this sheltered southern setting, pushing local readings to their worst point of the year. Things generally improve from spring onward, as this sheltered valley's breezes return more consistently, save for an occasional hot-weather ozone peak; autumn stays mostly mild.
Are air quality levels in Chiasso 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