Highest air pollution Cascais, today and tomorrow
Today (29 June): Air quality in Cascais is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 35.7/100).
Tomorrow (30 June 2026): Air quality in Cascais is fair. All pollutants stay as today. Pollution peaks around 1:00 PM (O3: 38.0/100). 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
Cascais' air quality benefits from its exceptional Atlantic Ocean exposure on the Estoril coast west of Lisbon, with consistent onshore Atlantic westerlies providing some of Portugal's most reliable maritime ventilation. This is consistently one of the Lisbon region's cleanest locations, with the open Atlantic fetch and the Sintra-Cascais Natural Park's forested hillside to the north providing a clean-air backdrop that makes Cascais among Portugal's best urban air quality environments throughout most of the year.
Today - 29 June | Pollution peaks at 13:00
AQI:
Fair
35.7/100
PM2.5 (fine particles):
Good
9.8/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Good
4.0/100
O3 (ozone):
Fair
35.7/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
7.0/100
Levels show the poorest local air quality during the day
Tomorrow - 30 June | Pollution peaks at 13:00
AQI:
Fair
38.0/100
PM2.5 (fine particles):
Good
9.6/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Good
5.3/100
O3 (ozone):
Fair
38.0/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.9/100
PM1 (ultrafine particles):
Good
7.4/100
Pollen forecast in Cascais
View pollen forecastFrequently Asked Questions
Is air quality bad in Cascais right now?
On 29 June 2026, overall air quality in Cascais is fair. AQI is the main air quality indicator at 35.7/100. Pollution peaks around 1:00 PM (O3: 35.7/100).
Will air quality be worse tomorrow in Cascais?
On 30 June 2026, air quality conditions in Cascais will be similar to today, with AQI forecast at fair at 38.0/100. Pollution peaks around 1:00 PM (O3: 38.0/100).
Are air quality levels in Cascais 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