Worst air pollution Alcalá de Henares, today and tomorrow
Today (30 August): Air quality in Alcalá de Henares is moderate. AQI and O3 are moderate; NO2 is fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 40.8/100).
Tomorrow (31 August 2026): Air quality in Alcalá de Henares is fair. AQI improves to fair; O3 decreases to fair; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 30.5/100). 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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Alcalá de Henares' air quality reflects its position in the Henares river corridor east of Madrid, with vehicle traffic on the A-2 national road and the surrounding automotive and pharmaceutical manufacturing industry contributing elevated NOₓ and industrial PM2.5. The Madrid metropolitan basin's temperature inversion problem affects the entire eastern corridor under calm anticyclonic conditions, while the Henares valley provides some limited ventilation on northeasterly wind days throughout the year.
Today - 30 August | Pollution peaks at 16:00
AQI:
Moderate
40.8/100
PM2.5 (fine particles):
Good
7.6/100
PM10 (coarse particles):
Good
3.3/100
NO2 (nitrogen dioxide):
Fair
22.9/100
O3 (ozone):
Moderate
40.8/100
SO2 (sulfur dioxide):
Good
4.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.2/100
PM1 (ultrafine particles):
Good
4.5/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 16:00
AQI:
Fair
30.5/100
PM2.5 (fine particles):
Good
10.6/100
PM10 (coarse particles):
Good
6.9/100
NO2 (nitrogen dioxide):
Fair
22.3/100
O3 (ozone):
Fair
30.5/100
SO2 (sulfur dioxide):
Good
2.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.3/100
PM1 (ultrafine particles):
Good
4.9/100
Pollen forecast in Alcalá de Henares
View pollen forecastFrequently Asked Questions
Is air quality bad in Alcalá de Henares right now?
On 30 August 2026, overall air quality in Alcalá de Henares is moderate. AQI is the main air quality indicator at 40.8/100. Pollution peaks around 4:00 PM (O3: 40.8/100).
Will air quality be worse tomorrow in Alcalá de Henares?
On 31 August 2026, air quality conditions in Alcalá de Henares will be better than today, with AQI forecast at fair at 30.5/100. Pollution peaks around 4:00 PM (O3: 30.5/100).
When is air pollution at its worst in Alcalá de Henares?
How do the seasons affect air quality in Alcalá de Henares? The winter months typically bring the weakest air quality of the year, as calm anticyclonic conditions trap vehicle and heating pollution near the surface. Conditions tend to ease in spring, as more active weather systems bring the wind and rain needed to disperse ground-level pollution. High summer temperatures and strong sun exposure drive ozone levels up, occasionally combined with smoke from nearby wildfires during dry spells. Autumn is typically a recovery period, with increasing rainfall and cooler air gradually reducing both ozone and traffic-related pollution. Being inland, this area sees more extreme summer heat and winter cold, which sharpens the seasonal contrast in air quality.
Are air quality levels in Alcalá de Henares 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: 30 August 2026 at 14:32 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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