City report · Madrid, Spain
Alcalá de Henares Air quality today
Air quality in Alcalá de Henares currently reads AQI 27 (Good): Air quality is satisfactory for everyone.
AQI 27
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 2.5
- tree cover
- 19.7%
- trees in this area
- 61.9K
- more trees needed
- 32.4K
Measured across a 2 km radius around Alcala de Henares, Madrid, Spain (12.57 km²), from a satellite image of Sep 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Alcalá de Henares · AQI 27 (Good)
Alcalá de Henares's tree count comes to 61,889 trees across 12.57 km², 10 points below the 30% tree-cover level considered healthy for this area, so roughly 32,358 more trees would close the gap.
Air quality detail
Air quality in Alcalá de Henares today: AQI 27, Good
Main pollutant: Ozone · Observed Nov 11, 17:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · TORREJON DE ARDOZ , 10.6 km away · median of 10 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.5
PM10
5.5
NO₂
3.5
O₃
58.5
SO₂
—
CO
425.0
Data: OpenAQ · EEA
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Alcalá de Henares's daily AQI at 45 on average, from 16 on Nov 10 to an hourly peak of 80 on Nov 6.
Where Alcalá de Henares stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Alcalá de Henares: Below target
19.7% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
61,889
Target trees
94,247
More trees needed
32,358
CO₂ if planted / yr
711.9 t
Deforestation · 2001–2025
How much forest has Alcalá de Henares lost?
Since 2001, the area within 10 km of Alcalá de Henares has lost about 36 hectares of forest (about 51 football pitches): 4.3% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 4 hectares (12%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 36 haabout 51 football pitches
- Share of its forest
- 4.3%of what there was in 2000
- Cleared for good
- 4 hadeforestation: turned into farms, mines or towns
The worst year was 2021, when about 20 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | 1 ha | 2 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | 1 ha | 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | 4 ha | 4 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | 2 ha | 2 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | 1 ha | 19 ha | 20 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Alcalá de Henares?
- Loggingcan grow back73% · 27 ha
- Farms, pasture and plantationscleared for good6.4% · 2 ha
- Towns and roadscleared for good5.2% · 2 ha
Also: wildfires, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 1,330 ha
- Forest in 2020
- 1,430 ha
- Overall change
- +93 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Alcalá de Henares grew from about 1,330 hectares to 1,430 hectares, a net gain of about 93 hectares (+7%). New forest grew on about 102 hectares, while 8 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
In the same region
Measured cities near Alcalá de Henares
Same 2 km radius, same index — so they compare directly.
- Alcobendas24.9 km
Spain
- Tree cover
- 12%
- Air quality
- 33
- Madrid29.9 km
Spain
- Tree cover
- 19%
- Air quality
- 39
- Leganés38.3 km
Spain
- Tree cover
- 11%
- Air quality
- 11
- Parla44.1 km
Spain
- Tree cover
- 4%
- Air quality
- 27
- Móstoles46.3 km
Spain
- Tree cover
- 12%
- Air quality
- 26
- Valladolid173.5 km
Spain
- Tree cover
- 17%
- Air quality
- 12
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Frequently asked
Questions about Alcalá de Henares
What is the air quality (AQI) in Alcalá de Henares right now?
The latest reading for Alcalá de Henares shows an AQI of 27 (Good), measured Nov 11, 17:00 local time by 10 ground monitoring stations via OpenAQ (the median of their readings; the nearest is TORREJON DE ARDOZ , 10.6 km away). The main pollutant is Ozone. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Alcalá de Henares today?
At AQI 27 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Alcalá de Henares been like this week?
Over the last 7 days, the CAMS air-quality model put Alcalá de Henares's daily AQI at 45 on average, from 16 on Nov 10 to an hourly peak of 80 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Alcalá de Henares lost since 2001?
Since 2001, the area within 10 km of Alcalá de Henares has lost about 36 hectares of forest (about 51 football pitches): 4.3% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 4 hectares (12%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Alcalá de Henares grew from about 1,330 hectares to 1,430 hectares, a net gain of about 93 hectares (+7%). New forest grew on about 102 hectares, while 8 hectares were lost.
What is the tree count in Alcalá de Henares?
Alcalá de Henares has an estimated 61,889 trees across the 12.57 km² measured — 19.7% tree cover, 10 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Alcalá de Henares need?
Alcalá de Henares needs roughly 32,358 more trees to close a 10-point shortfall against its 30% tree-cover target — about 711.9 t of extra CO₂ absorbed per year once grown.
How are Alcalá de Henares's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Alcala de Henares, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Alcala de Henares; the tree count is an estimate derived from that cover.
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