City report · Thuringia, Germany
Jena Air quality today
Air quality in Jena currently reads AQI 52 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 52
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 9.4
- tree cover
- 54.7%
- trees in this area
- 172K
- more trees needed
- 0
Measured across a 2 km radius around Jena, Germany (12.57 km²), from a satellite image of Aug 13, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Jena · AQI 52 (Moderate)
Jena's tree count comes to 171,673 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 Jena today: AQI 52, 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 · Jena Dammstr., 700 m away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
9.4
PM10
11.9
NO₂
26.5
O₃
—
SO₂
—
CO
—
Data: OpenAQ · EEA
- 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 Jena's daily AQI at 61 on average, from 47 on Nov 4 to an hourly peak of 77 on Nov 8.
Where Jena stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Jena: Healthy tree cover
54.7% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
171,673
Target trees
171,673
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Jena lost?
Since 2001, the area within 10 km of Jena has lost about 275 hectares of forest (about 390 football pitches): 2.7% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 29 hectares (11%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km southeast of the city center.
- Forest lost since 2001
- 275 haabout 390 football pitches
- Share of its forest
- 2.7%of what there was in 2000
- Cleared for good
- 29 hadeforestation: turned into farms, mines or towns
The worst year was 2021, when about 80 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 | 1 ha | 1 ha |
| 2002 | under 1 ha | 2 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 1 ha | 2 ha | 3 ha |
| 2005 | under 1 ha | 3 ha | 3 ha |
| 2006 | under 1 ha | 12 ha | 12 ha |
| 2007 | under 1 ha | 3 ha | 3 ha |
| 2008 | 6 ha | 2 ha | 9 ha |
| 2009 | 2 ha | 1 ha | 3 ha |
| 2010 | under 1 ha | 6 ha | 7 ha |
| 2011 | under 1 ha | 4 ha | 4 ha |
| 2012 | under 1 ha | under 1 ha | 1 ha |
| 2013 | under 1 ha | 3 ha | 3 ha |
| 2014 | under 1 ha | 4 ha | 5 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | 2 ha | 2 ha |
| 2017 | under 1 ha | 3 ha | 3 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | 10 ha | 10 ha |
| 2020 | 2 ha | 31 ha | 33 ha |
| 2021 | 12 ha | 69 ha | 80 ha |
| 2022 | under 1 ha | 34 ha | 35 ha |
| 2023 | 2 ha | 35 ha | 37 ha |
| 2024 | 1 ha | 16 ha | 17 ha |
| 2025 | under 1 ha | 4 ha | 4 ha |
What is causing deforestation around Jena?
- Loggingcan grow back84% · 231 ha
- Towns and roadscleared for good11% · 29 ha
- Unknown causescause unknown5.4% · 15 ha
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
- 11,500 ha
- Forest in 2020
- 11,700 ha
- Overall change
- +224 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Jena stayed about the same size, at about 11,700 hectares: new forest grew on about 284 hectares, and about 61 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 Jena
What is the air quality (AQI) in Jena right now?
The latest reading for Jena shows an AQI of 52 (Moderate), measured Nov 11, 17:00 local time by the Jena Dammstr. ground monitoring station, 700 m away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Jena today?
At AQI 52 (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 Jena been like this week?
Over the last 7 days, the CAMS air-quality model put Jena's daily AQI at 61 on average, from 47 on Nov 4 to an hourly peak of 77 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 Jena lost since 2001?
Since 2001, the area within 10 km of Jena has lost about 275 hectares of forest (about 390 football pitches): 2.7% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 29 hectares (11%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Jena stayed about the same size, at about 11,700 hectares: new forest grew on about 284 hectares, and about 61 hectares were lost.
What is the tree count in Jena?
Jena has an estimated 171,673 trees across the 12.56 km² of land measured — 54.7% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Jena need?
Jena has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Jena's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Jena, 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 Jena; the tree count is an estimate derived from that cover.
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