City report · Slovenia
Celje Air quality today
Air quality in Celje currently reads AQI 58 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 58
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 13.0
- tree cover
- 43.8%
- trees in this area
- 138K
- more trees needed
- 0
Measured across a 2 km radius around Celje, Slovenia (12.57 km²), from a satellite image of Sep 16, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Celje · AQI 58 (Moderate)
Celje's tree count comes to 137,602 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Celje today: AQI 58, 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 · Celje, 400 m away · median of 4 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
13.0
PM10
22.9
NO₂
32.5
O₃
—
SO₂
7.0
CO
—
Data: OpenAQ · EEA, Slovenian Environment Agency
- 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 Celje's daily AQI at 75 on average, from 59 on Nov 10 to an hourly peak of 109 on Nov 8.
Where Celje stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Celje: Healthy tree cover
43.8% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
137,602
Target trees
137,602
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Celje lost?
Since 2001, the area within 10 km of Celje has lost about 386 hectares of forest (about 540 football pitches): 2.5% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 86 hectares (22%) 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
- 386 haabout 540 football pitches
- Share of its forest
- 2.5%of what there was in 2000
- Cleared for good
- 86 hadeforestation: turned into farms, mines or towns
The worst year was 2024, when about 61 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 | under 1 ha | 3 ha | 3 ha |
| 2002 | 3 ha | 2 ha | 6 ha |
| 2003 | 3 ha | 2 ha | 5 ha |
| 2004 | 4 ha | 12 ha | 15 ha |
| 2005 | 3 ha | 10 ha | 13 ha |
| 2006 | 9 ha | 4 ha | 13 ha |
| 2007 | 16 ha | 11 ha | 26 ha |
| 2008 | 7 ha | 10 ha | 17 ha |
| 2009 | 3 ha | 12 ha | 15 ha |
| 2010 | 2 ha | 10 ha | 13 ha |
| 2011 | 2 ha | 8 ha | 10 ha |
| 2012 | 1 ha | 11 ha | 13 ha |
| 2013 | under 1 ha | 2 ha | 3 ha |
| 2014 | 1 ha | 8 ha | 9 ha |
| 2015 | 1 ha | 4 ha | 5 ha |
| 2016 | 2 ha | 14 ha | 16 ha |
| 2017 | 3 ha | 18 ha | 21 ha |
| 2018 | 7 ha | 5 ha | 12 ha |
| 2019 | under 1 ha | 7 ha | 8 ha |
| 2020 | 2 ha | 17 ha | 19 ha |
| 2021 | 2 ha | 10 ha | 12 ha |
| 2022 | 1 ha | 9 ha | 11 ha |
| 2023 | 2 ha | 44 ha | 46 ha |
| 2024 | 6 ha | 55 ha | 61 ha |
| 2025 | 3 ha | 14 ha | 17 ha |
What is causing deforestation around Celje?
- Loggingcan grow back71% · 276 ha
- Towns and roadscleared for good18% · 68 ha
- Farms, pasture and plantationscleared for good2.5% · 10 ha
Also: mining and energy, 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
- 16,800 ha
- Forest in 2020
- 16,800 ha
- Overall change
- −3 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Celje stayed about the same size, at about 16,800 hectares: new forest grew on about 140 hectares, and about 143 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 Celje
Same 2 km radius, same index — so they compare directly.
- Zagreb72.2 km
Croatia
- Tree cover
- 33%
- Air quality
- 117
- Klagenfurt am Wörthersee85.3 km
Austria
- Tree cover
- 26%
- Air quality
- 66
- Graz94.0 km
Austria
- Tree cover
- 28%
- Air quality
- 67
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Frequently asked
Questions about Celje
What is the air quality (AQI) in Celje right now?
The latest reading for Celje shows an AQI of 58 (Moderate), measured Nov 11, 17:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Celje, 400 m away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Celje today?
At AQI 58 (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 Celje been like this week?
Over the last 7 days, the CAMS air-quality model put Celje's daily AQI at 75 on average, from 59 on Nov 10 to an hourly peak of 109 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 Celje lost since 2001?
Since 2001, the area within 10 km of Celje has lost about 386 hectares of forest (about 540 football pitches): 2.5% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 86 hectares (22%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Celje stayed about the same size, at about 16,800 hectares: new forest grew on about 140 hectares, and about 143 hectares were lost.
What is the tree count in Celje?
Celje has an estimated 137,602 trees across the 12.57 km² measured — 43.8% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Celje need?
Celje has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Celje's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Celje, 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 Celje; the tree count is an estimate derived from that cover.
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