City report · Slovenia
Ljubljana Air quality today
Air quality in Ljubljana currently reads AQI 69 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 69
Moderate
- PM2.5, fine particles (µg/m³)
- 18.9
- tree cover
- 38.1%
- trees in this area
- 120K
- more trees needed
- 0
Measured across a 2 km radius around Ljubljana, Slovenia (12.57 km²), from a satellite image of Sep 16, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ljubljana · AQI 69 (Moderate)
Ljubljana's tree count comes to 119,575 trees across 12.56 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Ljubljana today: AQI 69, 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 · Modra rezidenca, 4.9 km away · median of 8 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
18.9
PM10
12.0
NO₂
26.7
O₃
—
SO₂
—
CO
420.0
Data: OpenAQ · AirGradient, EEA, Slovenian Environment Agency, Klem
- 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 Ljubljana's daily AQI at 88 on average, from 68 on Nov 4 to an hourly peak of 163 on Nov 8.
Where Ljubljana stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ljubljana: Healthy tree cover
38.1% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
119,575
Target trees
119,575
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Ljubljana lost?
Since 2001, the area within 10 km of Ljubljana has lost about 387 hectares of forest (about 540 football pitches): 3.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 81 hectares (21%) 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
- 387 haabout 540 football pitches
- Share of its forest
- 3.4%of what there was in 2000
- Cleared for good
- 81 hadeforestation: turned into farms, mines or towns
The worst year was 2014, when about 116 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 | 2 ha | under 1 ha | 3 ha |
| 2002 | under 1 ha | 5 ha | 6 ha |
| 2003 | 6 ha | 3 ha | 8 ha |
| 2004 | 6 ha | 3 ha | 9 ha |
| 2005 | 18 ha | 6 ha | 24 ha |
| 2006 | 1 ha | 2 ha | 4 ha |
| 2007 | under 1 ha | 2 ha | 3 ha |
| 2008 | 2 ha | 3 ha | 4 ha |
| 2009 | 1 ha | 3 ha | 5 ha |
| 2010 | 2 ha | 12 ha | 14 ha |
| 2011 | 1 ha | 5 ha | 6 ha |
| 2012 | under 1 ha | 2 ha | 3 ha |
| 2013 | 1 ha | 1 ha | 3 ha |
| 2014 | 6 ha | 110 ha | 116 ha |
| 2015 | 2 ha | 6 ha | 8 ha |
| 2016 | 8 ha | 40 ha | 48 ha |
| 2017 | 6 ha | 20 ha | 25 ha |
| 2018 | 2 ha | 8 ha | 10 ha |
| 2019 | under 1 ha | 13 ha | 14 ha |
| 2020 | 2 ha | 8 ha | 9 ha |
| 2021 | under 1 ha | 7 ha | 8 ha |
| 2022 | 1 ha | 5 ha | 6 ha |
| 2023 | 6 ha | 26 ha | 32 ha |
| 2024 | 3 ha | 6 ha | 9 ha |
| 2025 | 3 ha | 10 ha | 13 ha |
What is causing deforestation around Ljubljana?
- Loggingcan grow back75% · 292 ha
- Towns and roadscleared for good20% · 79 ha
- Unknown causescause unknown3.4% · 13 ha
Also: farms, pasture and plantations, storms, floods and other natural 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
- 13,700 ha
- Forest in 2020
- 13,800 ha
- Overall change
- +191 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ljubljana stayed about the same size, at about 13,800 hectares: new forest grew on about 353 hectares, and about 162 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 Ljubljana
Same 2 km radius, same index — so they compare directly.
- Klagenfurt am Wörthersee65.6 km
Austria
- Tree cover
- 26%
- Air quality
- 52
- Trieste71.9 km
Italy
- Tree cover
- 27%
- Air quality
- 52
- Rijeka80.7 km
Croatia
- Tree cover
- 44%
- Air quality
- 53
Also compared:Ljubljana vs Maribor
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Frequently asked
Questions about Ljubljana
What is the air quality (AQI) in Ljubljana right now?
The latest reading for Ljubljana shows an AQI of 69 (Moderate), measured Nov 11, 17:00 local time by 8 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Modra rezidenca, 4.9 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Ljubljana today?
At AQI 69 (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 Ljubljana been like this week?
Over the last 7 days, the CAMS air-quality model put Ljubljana's daily AQI at 88 on average, from 68 on Nov 4 to an hourly peak of 163 on Nov 8. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Ljubljana lost since 2001?
Since 2001, the area within 10 km of Ljubljana has lost about 387 hectares of forest (about 540 football pitches): 3.4% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 81 hectares (21%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Ljubljana stayed about the same size, at about 13,800 hectares: new forest grew on about 353 hectares, and about 162 hectares were lost.
What is the tree count in Ljubljana?
Ljubljana has an estimated 119,575 trees across the 12.56 km² of land measured — 38.1% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Ljubljana need?
Ljubljana has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Ljubljana's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Ljubljana, 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 Ljubljana; the tree count is an estimate derived from that cover.
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