City report · Slovenia
Koper Air quality today
Air quality in Koper currently reads AQI 49 (Good): Air quality is satisfactory for everyone.
AQI 49
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 8.9
- tree cover
- 16.6%
- trees in this area
- 31.8K
- more trees needed
- 25.6K
Measured across a 2 km radius around 6000 Koper, Slovenia (12.57 km²), from a satellite image of Sep 16, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Koper · AQI 49 (Good)
Koper's tree count comes to 31,760 trees across 7.66 km² of land, 13 points below the 30% tree-cover level considered healthy for this area, so roughly 25,637 more trees would close the gap.
Air quality detail
Air quality in Koper today: AQI 49, 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 · Koper, 1.4 km away · median of 2 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
8.9
PM10
9.2
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · EEA, Slovenian Environment Agency
- 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 Koper's daily AQI at 56 on average, from 45 on Nov 10 to an hourly peak of 76 on Nov 8.
Where Koper stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Koper: Critically low
16.6% tree cover against a 30% healthy-neighborhood target, across 7.66 km² of land.
Trees in this area
31,760
Target trees
57,397
More trees needed
25,637
CO₂ if planted / yr
564.0 t
Deforestation · 2001–2025
How much forest has Koper lost?
Since 2001, the area within 10 km of Koper has lost about 191 hectares of forest (about 270 football pitches): 2.4% of the forest it had in 2000. Most of it (75%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 191 haabout 270 football pitches
- Share of its forest
- 2.4%of what there was in 2000
- Cleared for good
- 145 hadeforestation: turned into farms, mines or towns
The worst year was 2020, when about 29 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 | under 1 ha | 6 ha |
| 2002 | 7 ha | under 1 ha | 7 ha |
| 2003 | 2 ha | under 1 ha | 2 ha |
| 2004 | 4 ha | under 1 ha | 4 ha |
| 2005 | 4 ha | under 1 ha | 4 ha |
| 2006 | 2 ha | under 1 ha | 2 ha |
| 2007 | 4 ha | under 1 ha | 4 ha |
| 2008 | 3 ha | 4 ha | 6 ha |
| 2009 | 5 ha | 2 ha | 7 ha |
| 2010 | 3 ha | under 1 ha | 4 ha |
| 2011 | under 1 ha | under 1 ha | 1 ha |
| 2012 | 4 ha | under 1 ha | 5 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 2 ha | 1 ha | 4 ha |
| 2015 | 2 ha | 1 ha | 3 ha |
| 2016 | 3 ha | 2 ha | 5 ha |
| 2017 | 4 ha | 3 ha | 7 ha |
| 2018 | 5 ha | 2 ha | 6 ha |
| 2019 | 24 ha | 3 ha | 26 ha |
| 2020 | 27 ha | 2 ha | 29 ha |
| 2021 | 8 ha | 1 ha | 9 ha |
| 2022 | 15 ha | 7 ha | 22 ha |
| 2023 | 4 ha | 12 ha | 16 ha |
| 2024 | 1 ha | 2 ha | 3 ha |
| 2025 | 4 ha | 2 ha | 6 ha |
What is causing deforestation around Koper?
- Towns and roadscleared for good51% · 98 ha
- Farms, pasture and plantationscleared for good24% · 46 ha
- Loggingcan grow back12% · 23 ha
Also: wildfires, 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
- 9,340 ha
- Forest in 2020
- 9,520 ha
- Overall change
- +178 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Koper stayed about the same size, at about 9,520 hectares: new forest grew on about 310 hectares, and about 132 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 Koper
Same 2 km radius, same index — so they compare directly.
- Rijeka60.8 km
Croatia
- Tree cover
- 44%
- Air quality
- 53
- Udine69.4 km
Italy
- Tree cover
- 24%
- Air quality
- 99
- Novo Mesto115.4 km
Slovenia
- Tree cover
- 41%
- Air quality
- 54
- Mestre115.8 km
Italy
- Tree cover
- 21%
- Air quality
- 113
- Klagenfurt am Wörthersee127.7 km
Austria
- Tree cover
- 26%
- Air quality
- 66
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Frequently asked
Questions about Koper
What is the air quality (AQI) in Koper right now?
The latest reading for Koper shows an AQI of 49 (Good), measured Nov 11, 17:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Koper, 1.4 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Koper today?
At AQI 49 (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 Koper been like this week?
Over the last 7 days, the CAMS air-quality model put Koper's daily AQI at 56 on average, from 45 on Nov 10 to an hourly peak of 76 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Koper lost since 2001?
Since 2001, the area within 10 km of Koper has lost about 191 hectares of forest (about 270 football pitches): 2.4% of the forest it had in 2000. Most of it (75%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Koper stayed about the same size, at about 9,520 hectares: new forest grew on about 310 hectares, and about 132 hectares were lost.
What is the tree count in Koper?
Koper has an estimated 31,760 trees across the 7.66 km² of land measured — 16.6% tree cover, 13 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Koper need?
Koper needs roughly 25,637 more trees to close a 13-point shortfall against its 30% tree-cover target — about 564.0 t of extra CO₂ absorbed per year once grown.
How are Koper's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near 6000 Koper, 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 6000 Koper; the tree count is an estimate derived from that cover.
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