City report · Rheinland-Pfalz, Germany
Trier Air quality today
Air quality in Trier currently reads AQI 55 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 55
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 11.1
- tree cover
- 46.8%
- trees in this area
- 141K
- more trees needed
- 0
Measured across a 2 km radius around Trier-Zentrum, Trier, Germany (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Trier · AQI 55 (Moderate)
Trier's tree count comes to 141,145 trees across 12.07 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Trier today: AQI 55, 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 · Trier-Ostallee, 600 m away · median of 2 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
11.1
PM10
—
NO₂
—
O₃
—
SO₂
1.0
CO
408.4
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 Trier's daily AQI at 63 on average, from 43 on Nov 4 to an hourly peak of 86 on Nov 7.
Where Trier stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Trier: Healthy tree cover
46.8% tree cover against a 30% healthy-neighborhood target, across 12.07 km² of land.
Trees in this area
141,145
Target trees
141,145
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Trier lost?
Since 2001, the area within 10 km of Trier has lost about 483 hectares of forest (about 680 football pitches): 3.8% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 60 hectares (12%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 6 km southwest of the city center.
- Forest lost since 2001
- 483 haabout 680 football pitches
- Share of its forest
- 3.8%of what there was in 2000
- Cleared for good
- 60 hadeforestation: turned into farms, mines or towns
The worst year was 2023, when about 79 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 | 7 ha | 9 ha |
| 2002 | under 1 ha | 1 ha | 2 ha |
| 2003 | under 1 ha | 5 ha | 6 ha |
| 2004 | 3 ha | 10 ha | 13 ha |
| 2005 | 1 ha | 4 ha | 5 ha |
| 2006 | 4 ha | 10 ha | 14 ha |
| 2007 | 2 ha | 6 ha | 8 ha |
| 2008 | 6 ha | 31 ha | 38 ha |
| 2009 | 2 ha | 3 ha | 5 ha |
| 2010 | 5 ha | 28 ha | 33 ha |
| 2011 | 3 ha | 4 ha | 7 ha |
| 2012 | under 1 ha | 9 ha | 9 ha |
| 2013 | 2 ha | 5 ha | 6 ha |
| 2014 | 6 ha | 6 ha | 12 ha |
| 2015 | under 1 ha | 2 ha | 3 ha |
| 2016 | 1 ha | 12 ha | 13 ha |
| 2017 | 3 ha | 14 ha | 17 ha |
| 2018 | under 1 ha | 4 ha | 5 ha |
| 2019 | 2 ha | 31 ha | 33 ha |
| 2020 | 5 ha | 31 ha | 36 ha |
| 2021 | 5 ha | 38 ha | 43 ha |
| 2022 | under 1 ha | 15 ha | 16 ha |
| 2023 | 3 ha | 76 ha | 79 ha |
| 2024 | 1 ha | 51 ha | 52 ha |
| 2025 | 1 ha | 21 ha | 22 ha |
What is causing deforestation around Trier?
- Loggingcan grow back84% · 406 ha
- Towns and roadscleared for good11% · 51 ha
- Farms, pasture and plantationscleared for good1.3% · 6 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
- 15,100 ha
- Forest in 2020
- 15,400 ha
- Overall change
- +236 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Trier stayed about the same size, at about 15,400 hectares: new forest grew on about 353 hectares, and about 118 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 Trier
Same 2 km radius, same index — so they compare directly.
- Luxembourg39.9 km
Luxembourg
- Tree cover
- 36%
- Air quality
- 44
- Saarbrücken64.0 km
Germany
- Tree cover
- 50%
- Air quality
- 72
- Metz78.4 km
France
- Tree cover
- 30%
- Air quality
- 27
- Koblenz94.4 km
Germany
- Tree cover
- 42%
- Air quality
- 60
- Bonn113.6 km
Germany
- Tree cover
- 40%
- Air quality
- 61
- Aachen120.2 km
Germany
- Tree cover
- 42%
- Air quality
- 52
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Frequently asked
Questions about Trier
What is the air quality (AQI) in Trier right now?
The latest reading for Trier shows an AQI of 55 (Moderate), measured Nov 11, 17:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Trier-Ostallee, 600 m away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Trier today?
At AQI 55 (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 Trier been like this week?
Over the last 7 days, the CAMS air-quality model put Trier's daily AQI at 63 on average, from 43 on Nov 4 to an hourly peak of 86 on Nov 7. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Trier lost since 2001?
Since 2001, the area within 10 km of Trier has lost about 483 hectares of forest (about 680 football pitches): 3.8% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 60 hectares (12%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Trier stayed about the same size, at about 15,400 hectares: new forest grew on about 353 hectares, and about 118 hectares were lost.
What is the tree count in Trier?
Trier has an estimated 141,145 trees across the 12.07 km² of land measured — 46.8% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Trier need?
Trier has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Trier's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Trier-Zentrum, 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 Trier-Zentrum; the tree count is an estimate derived from that cover.
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