Highest air pollution Castelo Branco, today and tomorrow
Today (29 June): Air quality in Castelo Branco is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 41.1/100).
Tomorrow (30 June 2026): Air quality in Castelo Branco is medium. All pollutants stay as today. Pollution peaks around 3:00 PM (O3: 43.6/100). 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
Castelo Branco's air quality benefits from its elevated Beira Baixa position at 379 metres near the Spanish border, with consistent Atlantic westerlies providing reliable ventilation across the flat Tagus interior plateau. Vehicle traffic on the A23 motorway and the surrounding agricultural and light manufacturing operations contribute the primary local sources, while the open Iberian plateau and Atlantic westerlies generally maintain Castelo Branco among Portugal's more moderate interior regional capital environments throughout the year.
Today - 29 June | Pollution peaks at 16:00
AQI:
Medium
41.1/100
PM2.5 (fine particles):
Good
9.4/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
15.4/100
O3 (ozone):
Medium
41.1/100
SO2 (sulfur dioxide):
Good
2.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.4/100
PM1 (ultrafine particles):
Good
7.1/100
Levels show the poorest local air quality during the day
Tomorrow - 30 June | Pollution peaks at 15:00
AQI:
Medium
43.6/100
PM2.5 (fine particles):
Good
11.8/100
PM10 (coarse particles):
Good
4.9/100
NO2 (nitrogen dioxide):
Good
18.0/100
O3 (ozone):
Medium
43.6/100
SO2 (sulfur dioxide):
Good
3.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.7/100
PM1 (ultrafine particles):
Good
8.6/100
Pollen forecast in Castelo Branco
View pollen forecastFrequently Asked Questions
Is air quality bad in Castelo Branco right now?
On 29 June 2026, overall air quality in Castelo Branco is medium. AQI is the main air quality indicator at 41.1/100. Pollution peaks around 4:00 PM (O3: 41.1/100).
Will air quality be worse tomorrow in Castelo Branco?
On 30 June 2026, air quality conditions in Castelo Branco will be similar to today, with AQI forecast at medium at 43.6/100. Pollution peaks around 3:00 PM (O3: 43.6/100).
Are air quality levels in Castelo Branco 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?
Check air quality in other popular cities:
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