Highest air pollution Viseu, today and tomorrow
Today (29 June): Air quality in Viseu is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 PM (O3: 33.0/100).
Tomorrow (30 June 2026): Air quality in Viseu is fair. All pollutants stay as today. Pollution peaks around 7:00 PM (O3: 35.5/100). 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
Viseu's air quality benefits from its elevated Dão river valley position at 483 metres in the Beira Alta highlands, with consistent Atlantic westerlies from the Portuguese coast providing reliable ventilation across this major wine and dairy producing region. Vehicle traffic on the A25 motorway and surrounding agricultural and manufacturing industry contribute the primary local emissions, while the elevated interior plateau position generally maintains Viseu among Portugal's cleaner regional capital urban environments.
Today - 29 June | Pollution peaks at 17:00
AQI:
Fair
33.0/100
PM2.5 (fine particles):
Good
4.1/100
PM10 (coarse particles):
Good
2.9/100
NO2 (nitrogen dioxide):
Good
4.5/100
O3 (ozone):
Fair
33.0/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.2/100
PM1 (ultrafine particles):
Good
3.2/100
Levels show the poorest local air quality during the day
Tomorrow - 30 June | Pollution peaks at 19:00
AQI:
Fair
35.5/100
PM2.5 (fine particles):
Good
3.3/100
PM10 (coarse particles):
Good
1.4/100
NO2 (nitrogen dioxide):
Good
5.3/100
O3 (ozone):
Fair
35.5/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.3/100
PM1 (ultrafine particles):
Good
2.5/100
Pollen forecast in Viseu
View pollen forecastFrequently Asked Questions
Is air quality bad in Viseu right now?
On 29 June 2026, overall air quality in Viseu is fair. AQI is the main air quality indicator at 33.0/100. Pollution peaks around 5:00 PM (O3: 33.0/100).
Will air quality be worse tomorrow in Viseu?
On 30 June 2026, air quality conditions in Viseu will be similar to today, with AQI forecast at fair at 35.5/100. Pollution peaks around 7:00 PM (O3: 35.5/100).
Are air quality levels in Viseu 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 Portugal?
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Data provided by Airmine — Last update: 29 June 2026 at 18:39 CET (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
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team