City report · Nepal
Lahān Air quality today
Air quality in Lahān currently reads AQI 65 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 65
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 18.3
- tree cover
- 34.2%
- trees in this area
- 107K
- more trees needed
- 0
Measured across a 2 km radius around Lahan, Madhesh Province, Nepal (12.57 km²), from a satellite image of Sep 20, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Lahān · AQI 65 (Moderate)
Lahān's tree count comes to 107,442 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 Lahān today: AQI 65, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 13:45 local time via Open-Meteo / CAMS, corrected with 18 ground-station cities within 245 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 18 station cities within 245 km, e.g. Janakpur and Biratnagar
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
18.3
PM10
37.8
NO₂
0.5
O₃
142.0
SO₂
7.6
CO
326.0
- 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 Lahān's daily AQI at 135 on average, from 112 on Nov 10 to an hourly peak of 184 on Nov 6.
Where Lahān stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Lahān: Healthy tree cover
34.2% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
107,442
Target trees
107,442
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Lahān lost?
Since 2001, the area within 10 km of Lahān has lost about 61 hectares of forest (about 85 football pitches): 6.1% of the forest it had in 2000. Most of it (84%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from February 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 61 haabout 85 football pitches
- Share of its forest
- 6.1%of what there was in 2000
- Cleared for good
- 51 hadeforestation: turned into farms, mines or towns
The worst year was 2004, when about 26 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 | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 22 ha | 5 ha | 26 ha |
| 2005 | 1 ha | under 1 ha | 2 ha |
| 2006 | 2 ha | under 1 ha | 3 ha |
| 2007 | 11 ha | 1 ha | 12 ha |
| 2008 | 2 ha | under 1 ha | 2 ha |
| 2009 | 2 ha | under 1 ha | 2 ha |
| 2010 | 9 ha | under 1 ha | 9 ha |
| 2011 | 1 ha | under 1 ha | 1 ha |
| 2012 | 1 ha | under 1 ha | 2 ha |
| 2013 | under 1 ha | under 1 ha | under 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 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Lahān?
- Farms, pasture and plantationscleared for good83% · 51 ha
- Loggingcan grow back2.1% · 1 ha
- Unknown causescause unknown13% · 8 ha
Also: towns and roads.
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
- 2,640 ha
- Forest in 2020
- 3,070 ha
- Overall change
- +429 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Lahān grew from about 2,640 hectares to 3,070 hectares, a net gain of about 429 hectares (+16%). New forest grew on about 535 hectares, while 106 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 Lahān
Same 2 km radius, same index — so they compare directly.
- Janakpur55.3 km
Nepal
- Tree cover
- 28%
- Air quality
- 190
- Dharān79.8 km
Nepal
- Tree cover
- 43%
- Air quality
- 59
- Biratnagar83.7 km
Nepal
- Tree cover
- 22%
- Air quality
- 183
- Darbhanga86.0 km
India
- Tree cover
- 29%
- Air quality
- 104
- Saharsa94.7 km
India
- Tree cover
- 38%
- Air quality
- 97
- Muzaffarpur127.4 km
India
- Tree cover
- 20%
- Air quality
- 163
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Frequently asked
Questions about Lahān
What is the air quality (AQI) in Lahān right now?
The latest reading for Lahān shows an AQI of 65 (Moderate), observed Nov 11, 13:45 local time via Open-Meteo / CAMS, corrected with 18 ground-station cities within 245 km, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Lahān today?
At AQI 65 (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 Lahān been like this week?
Over the last 7 days, the CAMS air-quality model put Lahān's daily AQI at 135 on average, from 112 on Nov 10 to an hourly peak of 184 on Nov 6. On 7 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Lahān lost since 2001?
Since 2001, the area within 10 km of Lahān has lost about 61 hectares of forest (about 85 football pitches): 6.1% of the forest it had in 2000. Most of it (84%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Lahān grew from about 2,640 hectares to 3,070 hectares, a net gain of about 429 hectares (+16%). New forest grew on about 535 hectares, while 106 hectares were lost.
What is the tree count in Lahān?
Lahān has an estimated 107,442 trees across the 12.57 km² measured — 34.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Lahān need?
Lahān has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Lahān's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Lahan; the tree count is an estimate derived from that cover.
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