Worst air pollution Sesimbra, today and tomorrow
Today (16 July): Air quality in Sesimbra is fair. AQI, PM2.5, NO2, and O3 are fair; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 PM (O3: 32.8/100).
Tomorrow (17 July 2026): Air quality in Sesimbra is fair. AQI improves to medium; NO2 decreases to medium; all other pollutants stay as today. Pollution peaks around 6:00 AM (NO2: 40.2/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Positioned on the Atlantic coast at the foot of the Arrábida hills, Sesimbra experiences air quality shaped chiefly by fishing-port activity and summer tourist traffic. The Setúbal terrain plays a role in how pollutants move through the area, with breezier conditions typically dispersing emissions faster than the still, settled spells that let them accumulate.
Today - 16 July | Pollution peaks at 20:00
AQI:
Fair
32.8/100
PM2.5 (fine particles):
Fair
23.1/100
PM10 (coarse particles):
Good
12.8/100
NO2 (nitrogen dioxide):
Fair
30.4/100
O3 (ozone):
Fair
32.8/100
SO2 (sulfur dioxide):
Good
6.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
16.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 06:00
AQI:
Medium
40.2/100
PM2.5 (fine particles):
Fair
24.0/100
PM10 (coarse particles):
Good
13.8/100
NO2 (nitrogen dioxide):
Medium
40.2/100
O3 (ozone):
Fair
34.6/100
SO2 (sulfur dioxide):
Good
5.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
16.7/100
Pollen forecast in Sesimbra
View pollen forecastFrequently Asked Questions
Is air quality bad in Sesimbra right now?
On 16 July 2026, overall air quality in Sesimbra is fair. AQI is the main air quality indicator at 32.8/100. Pollution peaks around 8:00 PM (O3: 32.8/100).
Will air quality be worse tomorrow in Sesimbra?
On 17 July 2026, air quality conditions in Sesimbra will be similar to today, with O3 forecast at fair at 34.6/100. Pollution peaks around 6:00 AM (NO2: 40.2/100).
When is air pollution at its worst in Sesimbra?
In Sesimbra, the combination of olive and oak pollen peaks and fishing-port activity and summer tourist traffic accounts for most of the noticeable dips in air quality; Setúbal's broader weather patterns tend to restore clearer conditions fairly quickly afterward.
Are air quality levels in Sesimbra 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: 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