City report · Catalonia, Spain
Terrassa Air quality today
Air quality in Terrassa currently reads AQI 29 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 29
Good
- PM2.5, fine particles (µg/m³)
- 5.2
- tree cover
- 8.2%
- trees in this area
- 25.7K
- more trees needed
- 68.4K
Measured across a 2 km radius around Terrassa, Barcelona, Spain (12.57 km²), from a satellite image of Sep 26, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Terrassa · AQI 29 (Good)
Terrassa's tree count comes to 25,735 trees across 12.56 km² of land, 22 points below the 30% tree-cover level considered healthy for this area, so roughly 68,418 more trees would close the gap.
Air quality detail
Air quality in Terrassa today: AQI 29, Good
Main pollutant: PM2.5 · Observed Nov 11, 17:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Polinya, 11.9 km away · median of 29 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.2
PM10
8.0
NO₂
12.0
O₃
51.0
SO₂
1.0
CO
200.0
Data: OpenAQ · AirGradient, EEA, Polinya, J.BCN, gonsalwy, Elías P., Timea Kiss
- 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 Terrassa's daily AQI at 63 on average, from 38 on Nov 4 to an hourly peak of 97 on Nov 9.
Where Terrassa stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Terrassa: Critically low
8.2% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
25,735
Target trees
94,153
More trees needed
68,418
CO₂ if planted / yr
1,505 t
Deforestation · 2001–2025
How much forest has Terrassa lost?
Since 2001, the area within 10 km of Terrassa has lost about 712 hectares of forest (about 1,000 football pitches): 5.9% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 227 hectares (32%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km northwest of the city center.
- Forest lost since 2001
- 712 haabout 1,000 football pitches
- Share of its forest
- 5.9%of what there was in 2000
- Cleared for good
- 227 hadeforestation: turned into farms, mines or towns
The worst year was 2015, when about 275 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 | 4 ha | under 1 ha | 4 ha |
| 2002 | 3 ha | 10 ha | 12 ha |
| 2003 | 6 ha | 3 ha | 9 ha |
| 2004 | 9 ha | 5 ha | 14 ha |
| 2005 | 15 ha | 10 ha | 25 ha |
| 2006 | 13 ha | 2 ha | 15 ha |
| 2007 | 15 ha | 2 ha | 17 ha |
| 2008 | 32 ha | 2 ha | 34 ha |
| 2009 | 5 ha | 2 ha | 7 ha |
| 2010 | 5 ha | 2 ha | 8 ha |
| 2011 | under 1 ha | 2 ha | 3 ha |
| 2012 | 7 ha | 9 ha | 15 ha |
| 2013 | under 1 ha | under 1 ha | 1 ha |
| 2014 | 6 ha | 11 ha | 17 ha |
| 2015 | 36 ha | 239 ha | 275 ha |
| 2016 | 10 ha | 77 ha | 86 ha |
| 2017 | 5 ha | 18 ha | 23 ha |
| 2018 | 11 ha | 15 ha | 26 ha |
| 2019 | 5 ha | 12 ha | 17 ha |
| 2020 | 8 ha | 11 ha | 19 ha |
| 2021 | 5 ha | 15 ha | 19 ha |
| 2022 | 8 ha | 10 ha | 18 ha |
| 2023 | 3 ha | 3 ha | 6 ha |
| 2024 | 11 ha | 13 ha | 24 ha |
| 2025 | 6 ha | 13 ha | 19 ha |
What is causing deforestation around Terrassa?
- Loggingcan grow back66% · 468 ha
- Towns and roadscleared for good31% · 218 ha
- Wildfirescan grow back1.3% · 9 ha
Also: mining and energy, farms, pasture and plantations, storms, floods and other natural causes, 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
- 17,400 ha
- Forest in 2020
- 17,500 ha
- Overall change
- +149 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Terrassa stayed about the same size, at about 17,500 hectares: new forest grew on about 332 hectares, and about 183 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
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Frequently asked
Questions about Terrassa
What is the air quality (AQI) in Terrassa right now?
The latest reading for Terrassa shows an AQI of 29 (Good), measured Nov 11, 17:00 local time by 29 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Polinya, 11.9 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Terrassa today?
At AQI 29 (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 Terrassa been like this week?
Over the last 7 days, the CAMS air-quality model put Terrassa's daily AQI at 63 on average, from 38 on Nov 4 to an hourly peak of 97 on Nov 9. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Terrassa lost since 2001?
Since 2001, the area within 10 km of Terrassa has lost about 712 hectares of forest (about 1,000 football pitches): 5.9% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 227 hectares (32%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Terrassa stayed about the same size, at about 17,500 hectares: new forest grew on about 332 hectares, and about 183 hectares were lost.
What is the tree count in Terrassa?
Terrassa has an estimated 25,735 trees across the 12.56 km² of land measured — 8.2% tree cover, 22 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Terrassa need?
Terrassa needs roughly 68,418 more trees to close a 22-point shortfall against its 30% tree-cover target — about 1,505 t of extra CO₂ absorbed per year once grown.
How are Terrassa's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Terrassa, 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 Terrassa; the tree count is an estimate derived from that cover.
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