Highest air pollution Santarém, today and tomorrow
Today (29 June): Air quality in Santarém is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 42.4/100).
Tomorrow (30 June 2026): Air quality in Santarém is fair. All pollutants stay as today. Pollution peaks around 2:00 PM (O3: 52.5/100). 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
Santarém's air quality in Portugal benefits from the flat Ribatejo plain position on the Tagus valley, with consistent Atlantic westerlies channelled through the Tagus corridor providing reliable ventilation across this historic hilltop agricultural city. Vehicle traffic on the A1 motorway and surrounding agri-food and agricultural industry contribute local sources, while the Tagus valley's open geometry and Atlantic estuary ventilation generally maintain Santarém among Portugal's more moderate central regional capital environments throughout most of the year.
Today - 29 June | Pollution peaks at 14:00
AQI:
Medium
42.4/100
PM2.5 (fine particles):
Good
15.5/100
PM10 (coarse particles):
Good
6.3/100
NO2 (nitrogen dioxide):
Fair
25.1/100
O3 (ozone):
Medium
42.4/100
SO2 (sulfur dioxide):
Good
5.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.1/100
PM1 (ultrafine particles):
Good
10.7/100
Levels show the poorest local air quality during the day
Tomorrow - 30 June | Pollution peaks at 14:00
AQI:
Medium
52.5/100
PM2.5 (fine particles):
Good
18.5/100
PM10 (coarse particles):
Good
7.8/100
NO2 (nitrogen dioxide):
Fair
21.0/100
O3 (ozone):
Medium
52.5/100
SO2 (sulfur dioxide):
Good
5.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.2/100
PM1 (ultrafine particles):
Good
13.0/100
Pollen forecast in Santarém
View pollen forecastFrequently Asked Questions
Is air quality bad in Santarém right now?
On 29 June 2026, overall air quality in Santarém is fair. NO2 is the main pollutant at 25.1/100. Pollution peaks around 2:00 PM (O3: 42.4/100).
Will air quality be worse tomorrow in Santarém?
On 30 June 2026, air quality conditions in Santarém will be similar to today, with NO2 forecast at fair at 21.0/100. Pollution peaks around 2:00 PM (O3: 52.5/100).
Are air quality levels in Santarém 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