City report · North Rhine-Westphalia, Germany
Hamm Air quality today
Air quality in Hamm currently reads AQI 104 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
AQI 104
Air quality right now
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 36.6
- tree cover
- 33.3%
- trees in this area
- 104K
- more trees needed
- 5.3K
Measured across a 2 km radius around Hamm, Germany (12.57 km²), from a satellite image of Sep 25, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Hamm · AQI 104 (Unhealthy for sensitive groups)
Hamm's tree count comes to 104,406 trees across 12.54 km² of land, 2 points below the 35% tree-cover level considered healthy for this area, so roughly 5,330 more trees would close the gap.
Air quality detail
Air quality in Hamm today: AQI 104, Unhealthy for sensitive groups
Main pollutant: PM2.5 · Observed Nov 11, 17:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Werne Innenstadt , 13 km away · median of 3 stations
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
36.6
PM10
21.8
NO₂
20.8
O₃
17.1
SO₂
—
CO
—
Data: OpenAQ · AirGradient, EEA
- Outdoor exercise
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise
- Windows
- Close them to keep the outside air out
- Mask
- Sensitive groups: an N95 outdoors
- Air purifier
- Run one, especially in bedrooms
Over the last 7 days, the CAMS air-quality model put Hamm's daily AQI at 65 on average, from 45 on Nov 4 to an hourly peak of 86 on Nov 8.
Where Hamm stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hamm: Below target
33.3% tree cover against a 35% healthy-neighborhood target, across 12.54 km² of land.
Trees in this area
104,406
Target trees
109,736
More trees needed
5,330
CO₂ if planted / yr
117.3 t
Deforestation · 2001–2025
How much forest has Hamm lost?
Since 2001, the area within 10 km of Hamm has lost about 108 hectares of forest (about 150 football pitches): 2.6% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 32 hectares (29%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 108 haabout 150 football pitches
- Share of its forest
- 2.6%of what there was in 2000
- Cleared for good
- 32 hadeforestation: turned into farms, mines or towns
The worst year was 2008, when about 11 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 | 6 ha | 7 ha |
| 2002 | under 1 ha | 2 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 2 ha | under 1 ha | 2 ha |
| 2005 | 10 ha | under 1 ha | 10 ha |
| 2006 | 1 ha | 2 ha | 4 ha |
| 2007 | under 1 ha | 3 ha | 3 ha |
| 2008 | 4 ha | 6 ha | 11 ha |
| 2009 | 9 ha | under 1 ha | 10 ha |
| 2010 | under 1 ha | 9 ha | 10 ha |
| 2011 | under 1 ha | 6 ha | 6 ha |
| 2012 | under 1 ha | 2 ha | 2 ha |
| 2013 | 1 ha | under 1 ha | 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | 1 ha | 2 ha | 3 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | 10 ha | 10 ha |
| 2020 | under 1 ha | 6 ha | 7 ha |
| 2021 | under 1 ha | 2 ha | 2 ha |
| 2022 | under 1 ha | 7 ha | 7 ha |
| 2023 | under 1 ha | 3 ha | 3 ha |
| 2024 | under 1 ha | 3 ha | 3 ha |
| 2025 | under 1 ha | 5 ha | 5 ha |
What is causing deforestation around Hamm?
- Loggingcan grow back57% · 61 ha
- Towns and roadscleared for good27% · 29 ha
- Mining and energycleared for good1.9% · 2 ha
Also: farms, pasture and plantations, 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
- 7,510 ha
- Forest in 2020
- 7,900 ha
- Overall change
- +390 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hamm grew from about 7,510 hectares to 7,900 hectares, a net gain of about 390 hectares (+5.2%). New forest grew on about 555 hectares, while 166 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 Hamm
What is the air quality (AQI) in Hamm right now?
The latest reading for Hamm shows an AQI of 104 (Unhealthy for sensitive groups), measured Nov 11, 17:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Werne Innenstadt , 13 km away). The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Hamm today?
At AQI 104 (Unhealthy for sensitive groups): children, older adults and people with asthma or heart disease should cut down long or hard exercise. Windows: close them to keep the outside air out. Masks: sensitive groups: an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Hamm been like this week?
Over the last 7 days, the CAMS air-quality model put Hamm's daily AQI at 65 on average, from 45 on Nov 4 to an hourly peak of 86 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 Hamm lost since 2001?
Since 2001, the area within 10 km of Hamm has lost about 108 hectares of forest (about 150 football pitches): 2.6% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 32 hectares (29%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Hamm grew from about 7,510 hectares to 7,900 hectares, a net gain of about 390 hectares (+5.2%). New forest grew on about 555 hectares, while 166 hectares were lost.
What is the tree count in Hamm?
Hamm has an estimated 104,406 trees across the 12.54 km² of land measured — 33.3% tree cover, 2 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Hamm need?
Hamm needs roughly 5,330 more trees to close a 2-point shortfall against its 35% tree-cover target — about 117.3 t of extra CO₂ absorbed per year once grown.
How are Hamm's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Hamm, 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 Hamm; the tree count is an estimate derived from that cover.
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