City report · Portugal
Porto Air quality today
Air quality in Porto currently reads AQI 78 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 78
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 23.6
- tree cover
- 15.2%
- trees in this area
- 45.5K
- more trees needed
- 44.3K
Measured across a 2 km radius around Porto, Portugal (12.57 km²), from a satellite image of Sep 18, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Porto · AQI 78 (Moderate)
Porto's tree count comes to 45,460 trees across 11.97 km² of land, 15 points below the 30% tree-cover level considered healthy for this area, so roughly 44,264 more trees would close the gap.
Air quality detail
Air quality in Porto today: AQI 78, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 17:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Porto_Ramalde, 2.6 km away · median of 9 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
23.6
PM10
8.7
NO₂
23.1
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, EEA, PORTO_AIRGRADIENT, Cesar Anjos
- 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 Porto's daily AQI at 54 on average, from 23 on Nov 9 to an hourly peak of 145 on Nov 6.
Where Porto stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Porto: Critically low
15.2% tree cover against a 30% healthy-neighborhood target, across 11.97 km² of land.
Trees in this area
45,460
Target trees
89,724
More trees needed
44,264
CO₂ if planted / yr
973.8 t
Deforestation · 2001–2025
How much forest has Porto lost?
Since 2001, the area within 10 km of Porto has lost about 1,770 hectares of forest (about 2,500 football pitches): 67% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 508 hectares (29%) 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 southeast of the city center.
- Forest lost since 2001
- 1,770 haabout 2,500 football pitches
- Share of its forest
- 67%of what there was in 2000
- Cleared for good
- 508 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 65 hectares a year in 2021–2025, down from 127 hectares a year in 2016–2020. The worst year was 2016, when about 189 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 | 6 ha | 9 ha | 15 ha |
| 2002 | 8 ha | 18 ha | 26 ha |
| 2003 | 7 ha | 4 ha | 11 ha |
| 2004 | 24 ha | 31 ha | 54 ha |
| 2005 | 27 ha | 41 ha | 68 ha |
| 2006 | 12 ha | 24 ha | 36 ha |
| 2007 | 20 ha | 46 ha | 67 ha |
| 2008 | 12 ha | 38 ha | 49 ha |
| 2009 | 29 ha | 41 ha | 69 ha |
| 2010 | 20 ha | 43 ha | 64 ha |
| 2011 | 13 ha | 39 ha | 52 ha |
| 2012 | 23 ha | 14 ha | 37 ha |
| 2013 | 10 ha | 38 ha | 49 ha |
| 2014 | 28 ha | 51 ha | 79 ha |
| 2015 | 22 ha | 117 ha | 139 ha |
| 2016 | 35 ha | 154 ha | 189 ha |
| 2017 | 34 ha | 108 ha | 142 ha |
| 2018 | 45 ha | 93 ha | 138 ha |
| 2019 | 39 ha | 66 ha | 105 ha |
| 2020 | 18 ha | 42 ha | 59 ha |
| 2021 | 20 ha | 63 ha | 83 ha |
| 2022 | 14 ha | 40 ha | 54 ha |
| 2023 | 18 ha | 40 ha | 57 ha |
| 2024 | 13 ha | 65 ha | 77 ha |
| 2025 | 15 ha | 38 ha | 52 ha |
What is causing deforestation around Porto?
- Loggingcan grow back56% · 998 ha
- Towns and roadscleared for good29% · 508 ha
- Wildfirescan grow back15% · 265 ha
Also: 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
- 5,350 ha
- Forest in 2020
- 5,310 ha
- Overall change
- −43 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Porto stayed about the same size, at about 5,310 hectares: new forest grew on about 433 hectares, and about 475 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 Porto
Same 2 km radius, same index — so they compare directly.
- Viseu80.1 km
Portugal
- Tree cover
- 36%
- Air quality
- 53
- Vigo120.9 km
Spain
- Tree cover
- 15%
- Air quality
- 69
- Ourense145.9 km
Spain
- Tree cover
- 32%
- Air quality
- 64
- Leiria157.1 km
Portugal
- Tree cover
- 27%
- Air quality
- 28
Also compared:Porto vs Lisbon
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Frequently asked
Questions about Porto
What is the air quality (AQI) in Porto right now?
The latest reading for Porto shows an AQI of 78 (Moderate), measured Nov 11, 17:00 local time by 9 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Porto_Ramalde, 2.6 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Porto today?
At AQI 78 (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 Porto been like this week?
Over the last 7 days, the CAMS air-quality model put Porto's daily AQI at 54 on average, from 23 on Nov 9 to an hourly peak of 145 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 Porto lost since 2001?
Since 2001, the area within 10 km of Porto has lost about 1,770 hectares of forest (about 2,500 football pitches): 67% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 508 hectares (29%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 65 hectares a year in 2021–2025, down from 127 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Porto stayed about the same size, at about 5,310 hectares: new forest grew on about 433 hectares, and about 475 hectares were lost.
What is the tree count in Porto?
Porto has an estimated 45,460 trees across the 11.97 km² of land measured — 15.2% tree cover, 15 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Porto need?
Porto needs roughly 44,264 more trees to close a 15-point shortfall against its 30% tree-cover target — about 973.8 t of extra CO₂ absorbed per year once grown.
How are Porto's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Porto, 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 Porto; the tree count is an estimate derived from that cover.
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