Worst air pollution Covilhã, today and tomorrow
Today (20 September): Air quality in Covilhã is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 PM (O3: 30.2/100).
Tomorrow (21 September 2026): Air quality in Covilhã is fair. All pollutants stay as today. Pollution peaks around 5:00 PM (O3: 33.9/100). Airmine updates local air quality forecasts four times daily.
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Covilhã's air quality reflects the Serra da Estrela foothills at 675 metres in the Beira Interior, with vehicle traffic on the A23 motorway and the surrounding wool textile and University of Beira Interior operations contributing local sources. The Serra da Estrela massif creates dramatic topographic variation, while Atlantic westerlies provide ventilation and Covilhã's elevated mountain position generally maintains better conditions than Portuguese lowland cities, though valley inversions can concentrate emissions under calm conditions throughout the year.
Today - 20 September | Pollution peaks at 17:00
AQI:
Fair
30.2/100
PM2.5 (fine particles):
Good
16.0/100
PM10 (coarse particles):
Good
8.5/100
NO2 (nitrogen dioxide):
Good
14.6/100
O3 (ozone):
Fair
30.2/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
3.5/100
PM1 (ultrafine particles):
Good
9.4/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 17:00
AQI:
Fair
33.9/100
PM2.5 (fine particles):
Good
11.3/100
PM10 (coarse particles):
Good
6.2/100
NO2 (nitrogen dioxide):
Good
19.4/100
O3 (ozone):
Fair
33.9/100
SO2 (sulfur dioxide):
Good
1.1/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
4.4/100
PM1 (ultrafine particles):
Good
5.5/100
Pollen forecast in Covilhã
View pollen forecastFrequently Asked Questions
Is air quality bad in Covilhã right now?
On 20 September 2026, overall air quality in Covilhã is fair. AQI is the main air quality indicator at 30.2/100. Pollution peaks around 5:00 PM (O3: 30.2/100).
Will air quality be worse tomorrow in Covilhã?
On 21 September 2026, air quality conditions in Covilhã will be similar to today, with AQI forecast at fair at 33.9/100. Pollution peaks around 5:00 PM (O3: 33.9/100).
When is air pollution at its worst in Covilhã?
Reduced air quality in Covilhã is most likely when local tree and grass allergens peaks, alongside periods of vehicle traffic on the A23 motorway and the neighbouring wool textile and University of Beira Interior; the rest of the calendar year is generally more forgiving for air quality.
Are air quality levels in Covilhã 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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