City report · Portugal
Coimbra Air quality today
Air quality in Coimbra currently reads AQI 65 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 65
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 14.2
- tree cover
- 26.4%
- trees in this area
- 79.0K
- more trees needed
- 10.8K
Measured across a 2 km radius around Bairro Sousa Pinto, Coimbra, Portugal (12.57 km²), from a satellite image of Sep 15, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Coimbra · AQI 65 (Moderate)
Coimbra's tree count comes to 79,040 trees across 11.98 km² of land, 4 points below the 30% tree-cover level considered healthy for this area, so roughly 10,778 more trees would close the gap.
Air quality detail
Air quality in Coimbra today: AQI 65, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 00:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 185 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 185 km, e.g. Braga and Queluz
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
14.2
PM10
12.4
NO₂
4.5
O₃
59.0
SO₂
0.7
CO
131.0
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Coimbra's daily AQI at 44 on average, from 23 on Nov 9 to an hourly peak of 105 on Nov 6.
Where Coimbra stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Coimbra: Below target
26.4% tree cover against a 30% healthy-neighborhood target, across 11.98 km² of land.
Trees in this area
79,040
Target trees
89,818
More trees needed
10,778
CO₂ if planted / yr
237.1 t
Deforestation · 2001–2025
How much forest has Coimbra lost?
Since 2001, the area within 10 km of Coimbra has lost about 9,160 hectares of forest (about 13,000 football pitches): 61% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 320 hectares (3.5%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 9,160 haabout 13,000 football pitches
- Share of its forest
- 61%of what there was in 2000
- Cleared for good
- 320 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 338 hectares a year in 2021–2025, down from 714 hectares a year in 2016–2020. The worst year was 2017, when about 1,470 hectares of forest were lost, mostly to wildfires.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 2 ha | 94 ha | 96 ha |
| 2002 | 4 ha | 82 ha | 86 ha |
| 2003 | 12 ha | 44 ha | 56 ha |
| 2004 | 6 ha | 92 ha | 99 ha |
| 2005 | 32 ha | 534 ha | 566 ha |
| 2006 | 8 ha | 143 ha | 151 ha |
| 2007 | 12 ha | 163 ha | 175 ha |
| 2008 | 14 ha | 331 ha | 345 ha |
| 2009 | 7 ha | 347 ha | 354 ha |
| 2010 | 9 ha | 204 ha | 213 ha |
| 2011 | 42 ha | 149 ha | 190 ha |
| 2012 | 26 ha | 337 ha | 363 ha |
| 2013 | 10 ha | 294 ha | 304 ha |
| 2014 | 10 ha | 402 ha | 411 ha |
| 2015 | 2 ha | 494 ha | 496 ha |
| 2016 | 11 ha | 715 ha | 726 ha |
| 2017 | 24 ha | 1,440 ha | 1,470 ha |
| 2018 | 12 ha | 450 ha | 462 ha |
| 2019 | 7 ha | 325 ha | 332 ha |
| 2020 | 20 ha | 560 ha | 580 ha |
| 2021 | 10 ha | 479 ha | 489 ha |
| 2022 | 9 ha | 340 ha | 349 ha |
| 2023 | 10 ha | 312 ha | 322 ha |
| 2024 | 11 ha | 320 ha | 331 ha |
| 2025 | 11 ha | 188 ha | 198 ha |
What is causing deforestation around Coimbra?
- Loggingcan grow back71% · 6,510 ha
- Wildfirescan grow back25% · 2,330 ha
- Towns and roadscleared for good3.5% · 317 ha
Also: farms, pasture and plantations, 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
- 17,900 ha
- Forest in 2020
- 17,200 ha
- Overall change
- −742 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Coimbra shrank from about 17,900 hectares to 17,200 hectares, a net loss of about 742 hectares (−4.1%). New forest grew on about 314 hectares, but 1,060 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 Coimbra
Same 2 km radius, same index — so they compare directly.
- Queluz176.5 km
Portugal
- Tree cover
- 21%
- Air quality
- 8
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Frequently asked
Questions about Coimbra
What is the air quality (AQI) in Coimbra right now?
The latest reading for Coimbra shows an AQI of 65 (Moderate), observed Nov 11, 00:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 185 km, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Coimbra today?
At AQI 65 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Coimbra been like this week?
Over the last 7 days, the CAMS air-quality model put Coimbra's daily AQI at 44 on average, from 23 on Nov 9 to an hourly peak of 105 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 Coimbra lost since 2001?
Since 2001, the area within 10 km of Coimbra has lost about 9,160 hectares of forest (about 13,000 football pitches): 61% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 320 hectares (3.5%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 338 hectares a year in 2021–2025, down from 714 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Coimbra shrank from about 17,900 hectares to 17,200 hectares, a net loss of about 742 hectares (−4.1%). New forest grew on about 314 hectares, but 1,060 hectares were lost.
What is the tree count in Coimbra?
Coimbra has an estimated 79,040 trees across the 11.98 km² of land measured — 26.4% tree cover, 4 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Coimbra need?
Coimbra needs roughly 10,778 more trees to close a 4-point shortfall against its 30% tree-cover target — about 237.1 t of extra CO₂ absorbed per year once grown.
How are Coimbra's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Bairro Sousa Pinto; the tree count is an estimate derived from that cover.
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