Highest air pollution Coimbra, today and tomorrow
Today (29 June): Air quality in Coimbra is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 35.4/100).
Tomorrow (30 June 2026): Air quality in Coimbra is fair. NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 3:00 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
Coimbra's air quality reflects its position in the Mondego river valley between the Serra da Lousã and the Beiras Litoral coast, with vehicle traffic on the A1 motorway and the surrounding university hospital and light manufacturing corridor contributing local sources. The Mondego valley provides ventilation on Atlantic westerly days, while the surrounding highland terrain creates topographic variation and the Atlantic coastal proximity generally maintains moderate Portuguese urban air quality levels in this historic university city.
Today - 29 June | Pollution peaks at 16:00
AQI:
Fair
35.4/100
PM2.5 (fine particles):
Good
7.7/100
PM10 (coarse particles):
Good
5.3/100
NO2 (nitrogen dioxide):
Good
16.3/100
O3 (ozone):
Fair
35.4/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.7/100
PM1 (ultrafine particles):
Good
5.5/100
Levels show the poorest local air quality during the day
Tomorrow - 30 June | Pollution peaks at 15:00
AQI:
Fair
35.5/100
PM2.5 (fine particles):
Good
8.7/100
PM10 (coarse particles):
Good
3.8/100
NO2 (nitrogen dioxide):
Fair
20.6/100
O3 (ozone):
Fair
35.5/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.1/100
PM1 (ultrafine particles):
Good
6.6/100
Pollen forecast in Coimbra
View pollen forecastFrequently Asked Questions
Is air quality bad in Coimbra right now?
On 29 June 2026, overall air quality in Coimbra is fair. AQI is the main air quality indicator at 35.4/100. Pollution peaks around 4:00 PM (O3: 35.4/100).
Will air quality be worse tomorrow in Coimbra?
On 30 June 2026, air quality conditions in Coimbra will be similar to today, with AQI forecast at fair at 35.5/100. Pollution peaks around 3:00 PM (O3: 35.5/100).
Are air quality levels in Coimbra 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?
Check air quality in other popular cities:
Data provided by Airmine — Last update: 29 June 2026 at 18:38 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