Highest air pollution Sintra hills - Lisbon, today and tomorrow
Today (29 June): Air quality in Sintra hills 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 Sintra hills 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
Lisbon's Sintra hills record excellent air quality on the UNESCO-listed ridge above the Atlantic plain northwest of Lisbon, with consistent Atlantic Ocean airflows providing outstanding clean maritime ventilation throughout the year. This is consistently one of the cleanest locations in the greater Lisbon region, with readings approaching open ocean coastal values on most days.
Today - 29 June | Pollution peaks at 13:00
AQI:
Fair
35.7/100
PM2.5 (fine particles):
Good
10.3/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
5.5/100
O3 (ozone):
Fair
35.7/100
SO2 (sulfur dioxide):
Good
1.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
7.3/100
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
10.1/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
7.2/100
O3 (ozone):
Fair
38.0/100
SO2 (sulfur dioxide):
Good
1.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.9/100
PM1 (ultrafine particles):
Good
7.7/100
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Frequently Asked Questions
Is air quality bad in Sintra hills right now?
On 29 June 2026, overall air quality in Sintra hills 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 Sintra hills?
On 30 June 2026, air quality conditions in Sintra hills 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 Sintra hills 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.
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Data provided by Airmine — Last update: 29 June 2026 at 18:37 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