City report · Portugal
Leiria Air quality today
Air quality in Leiria currently reads AQI 28 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 28
Good
- PM2.5, fine particles (µg/m³)
- 6.2
- tree cover
- 27.3%
- trees in this area
- 85.8K
- more trees needed
- 8.5K
Measured across a 2 km radius around Leiria, Portugal (12.57 km²), from a satellite image of Sep 18, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Leiria · AQI 28 (Good)
Leiria's tree count comes to 85,765 trees across 12.57 km², 3 points below the 30% tree-cover level considered healthy for this area, so roughly 8,482 more trees would close the gap.
Air quality detail
Air quality in Leiria today: AQI 28, Good
Main pollutant: PM2.5 · Observed Nov 10, 17:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 205 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 3 station cities within 205 km, e.g. Coimbra and Queluz
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.2
PM10
12.9
NO₂
3.8
O₃
68.0
SO₂
0.6
CO
123.0
- 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 Leiria's daily AQI at 36 on average, from 21 on Nov 10 to an hourly peak of 78 on Nov 4.
Where Leiria stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Leiria: Below target
27.3% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
85,765
Target trees
94,247
More trees needed
8,482
CO₂ if planted / yr
186.6 t
Deforestation · 2001–2025
How much forest has Leiria lost?
Since 2001, the area within 10 km of Leiria has lost about 6,770 hectares of forest (about 9,500 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 220 hectares (3.2%) 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 northeast of the city center.
- Forest lost since 2001
- 6,770 haabout 9,500 football pitches
- Share of its forest
- 67%of what there was in 2000
- Cleared for good
- 220 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 194 hectares a year in 2021–2025, down from 290 hectares a year in 2016–2020. The worst year was 2006, when about 546 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 | 114 ha | 120 ha |
| 2002 | 7 ha | 131 ha | 138 ha |
| 2003 | 3 ha | 277 ha | 280 ha |
| 2004 | 4 ha | 105 ha | 109 ha |
| 2005 | 9 ha | 150 ha | 159 ha |
| 2006 | 20 ha | 526 ha | 546 ha |
| 2007 | 20 ha | 360 ha | 380 ha |
| 2008 | 4 ha | 241 ha | 245 ha |
| 2009 | 9 ha | 312 ha | 321 ha |
| 2010 | 24 ha | 403 ha | 427 ha |
| 2011 | 10 ha | 254 ha | 264 ha |
| 2012 | 7 ha | 335 ha | 342 ha |
| 2013 | 5 ha | 305 ha | 310 ha |
| 2014 | 7 ha | 401 ha | 408 ha |
| 2015 | 10 ha | 299 ha | 308 ha |
| 2016 | 13 ha | 416 ha | 429 ha |
| 2017 | 12 ha | 281 ha | 293 ha |
| 2018 | 11 ha | 326 ha | 337 ha |
| 2019 | 10 ha | 154 ha | 164 ha |
| 2020 | 7 ha | 219 ha | 226 ha |
| 2021 | 5 ha | 167 ha | 172 ha |
| 2022 | 6 ha | 337 ha | 343 ha |
| 2023 | 4 ha | 216 ha | 220 ha |
| 2024 | 1 ha | 132 ha | 133 ha |
| 2025 | 5 ha | 96 ha | 100 ha |
What is causing deforestation around Leiria?
- Loggingcan grow back92% · 6,240 ha
- Wildfirescan grow back4.7% · 316 ha
- Towns and roadscleared for good3.2% · 220 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
- 15,300 ha
- Forest in 2020
- 14,500 ha
- Overall change
- −769 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Leiria shrank from about 15,300 hectares to 14,500 hectares, a net loss of about 769 hectares (−5%). New forest grew on about 671 hectares, but 1,440 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 Leiria
What is the air quality (AQI) in Leiria right now?
The latest reading for Leiria shows an AQI of 28 (Good), observed Nov 10, 17:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 205 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Leiria today?
At AQI 28 (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 Leiria been like this week?
Over the last 7 days, the CAMS air-quality model put Leiria's daily AQI at 36 on average, from 21 on Nov 10 to an hourly peak of 78 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Leiria lost since 2001?
Since 2001, the area within 10 km of Leiria has lost about 6,770 hectares of forest (about 9,500 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 220 hectares (3.2%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 194 hectares a year in 2021–2025, down from 290 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Leiria shrank from about 15,300 hectares to 14,500 hectares, a net loss of about 769 hectares (−5%). New forest grew on about 671 hectares, but 1,440 hectares were lost.
What is the tree count in Leiria?
Leiria has an estimated 85,765 trees across the 12.57 km² measured — 27.3% tree cover, 3 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Leiria need?
Leiria needs roughly 8,482 more trees to close a 3-point shortfall against its 30% tree-cover target — about 186.6 t of extra CO₂ absorbed per year once grown.
How are Leiria'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 Leiria; the tree count is an estimate derived from that cover.
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