Worst air pollution Viseu, today and tomorrow
Today (16 July): 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 3:00 AM (O3: 26.1/100).
Tomorrow (17 July 2026): Air quality in Viseu is fair. All pollutants stay as today. Pollution peaks around 4:00 AM (O3: 20.1/100). 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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Viseu in Brazil reflects the Pará Amazon eastern zone position, with vehicle emissions from the BR-316 and surrounding agricultural and light manufacturing contributing local sources. Dry season burning from surrounding Pará Amazon deforestation generates regional PM2.5 episodes between July and November that represent the primary seasonal air quality challenge, while Atlantic equatorial airflows provide background ventilation throughout the rest of the year.
Today - 16 July | Pollution peaks at 03:00
AQI:
Fair
26.1/100
PM2.5 (fine particles):
Good
9.7/100
PM10 (coarse particles):
Good
4.1/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
26.1/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.6/100
PM1 (ultrafine particles):
Good
3.6/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 04:00
AQI:
Fair
20.1/100
PM2.5 (fine particles):
Good
9.6/100
PM10 (coarse particles):
Good
3.9/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
20.1/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.7/100
PM1 (ultrafine particles):
Good
5.3/100
Pollen forecast in Viseu
View pollen forecastFrequently Asked Questions
Is air quality bad in Viseu right now?
On 16 July 2026, overall air quality in Viseu is fair. AQI is the main air quality indicator at 26.1/100. Pollution peaks around 3:00 AM (O3: 26.1/100).
Will air quality be worse tomorrow in Viseu?
On 17 July 2026, air quality conditions in Viseu will be similar to today, with AQI forecast at fair at 20.1/100. Pollution peaks around 4:00 AM (O3: 20.1/100).
When is air pollution at its worst in Viseu?
The most noticeable dips in Viseu's air quality come when native Amazon forest remnants and babaçu palm pollen peaks, or because of vehicle emissions from the BR-316 and surrounding agricultural and light manufacturing; a change of season or a spell of wind usually clears things up again.
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 Brazil?
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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