Highest air pollution Porto, today and tomorrow
Today (29 June): Air quality in Porto 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: 34.1/100).
Tomorrow (30 June 2026): Air quality in Porto is fair. All pollutants stay as today. Pollution peaks around 6:00 PM (O3: 36.9/100). 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
Porto's air quality benefits from its Atlantic coastal position at the mouth of the Douro river, with consistent westerly winds from the Atlantic providing reliable maritime ventilation across this northern Portuguese city. Vehicle traffic on the VCI ring road and the surrounding industrial and port corridor are the primary local sources, while the Douro valley provides natural ventilation and the Atlantic exposure generally keeps Porto among the better air quality environments for a major Iberian metropolitan area.
Today - 29 June | Pollution peaks at 17:00
AQI:
Fair
34.1/100
PM2.5 (fine particles):
Good
5.1/100
PM10 (coarse particles):
Good
2.2/100
NO2 (nitrogen dioxide):
Good
3.3/100
O3 (ozone):
Fair
34.1/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.8/100
PM1 (ultrafine particles):
Good
3.9/100
Levels show the poorest local air quality during the day
Tomorrow - 30 June | Pollution peaks at 18:00
AQI:
Fair
36.9/100
PM2.5 (fine particles):
Good
2.9/100
PM10 (coarse particles):
Good
1.1/100
NO2 (nitrogen dioxide):
Good
4.1/100
O3 (ozone):
Fair
36.9/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.2/100
PM1 (ultrafine particles):
Good
1.8/100
Pollen forecast in Porto
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Porto
Frequently Asked Questions
Is air quality bad in Porto right now?
On 29 June 2026, overall air quality in Porto is fair. AQI is the main air quality indicator at 34.1/100. Pollution peaks around 5:00 PM (O3: 34.1/100).
Will air quality be worse tomorrow in Porto?
On 30 June 2026, air quality conditions in Porto will be similar to today, with AQI forecast at fair at 36.9/100. Pollution peaks around 6:00 PM (O3: 36.9/100).
Are air quality levels in Porto 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 18:38 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