City report · Thailand
Udon Thani Air quality today
Air quality in Udon Thani currently reads AQI 51 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 51
Moderate
- PM2.5, fine particles (µg/m³)
- 9.2
- tree cover
- 27.0%
- trees in this area
- 83.2K
- more trees needed
- 9.2K
Measured across a 2 km radius around Mak Khaeng Sub-district, Mueang Udon Thani District, Udon Thani 41000, Thailand (12.57 km²), from a satellite image of Sep 22, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Udon Thani · AQI 51 (Moderate)
Udon Thani's tree count comes to 83,211 trees across 12.33 km² of land, 3 points below the 30% tree-cover level considered healthy for this area, so roughly 9,246 more trees would close the gap.
Air quality detail
Air quality in Udon Thani today: AQI 51, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 22:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Nong Prajak Public Park, Udon Thani, 600 m away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
9.2
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · Air4Thai, Pollution Control Department, Thailand · Air4Thai
- 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 Udon Thani's daily AQI at 23 on average, from 13 on Nov 10 to an hourly peak of 44 on Nov 6.
Where Udon Thani stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Udon Thani: Below target
27.0% tree cover against a 30% healthy-neighborhood target, across 12.33 km² of land.
Trees in this area
83,211
Target trees
92,457
More trees needed
9,246
CO₂ if planted / yr
203.4 t
Deforestation · 2001–2025
How much forest has Udon Thani lost?
Since 2001, the area within 10 km of Udon Thani has lost about 96 hectares of forest (about 130 football pitches): 19% of the forest it had in 2000. Most of it (99%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2018: satellite photo from December 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 96 haabout 130 football pitches
- Share of its forest
- 19%of what there was in 2000
- Cleared for good
- 95 hadeforestation: turned into farms, mines or towns
The worst year was 2008, when about 12 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 | 1 ha | under 1 ha | 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 2 ha | under 1 ha | 2 ha |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | 12 ha | under 1 ha | 12 ha |
| 2009 | 3 ha | under 1 ha | 3 ha |
| 2010 | 5 ha | under 1 ha | 5 ha |
| 2011 | 3 ha | under 1 ha | 3 ha |
| 2012 | 9 ha | under 1 ha | 9 ha |
| 2013 | 5 ha | under 1 ha | 5 ha |
| 2014 | 5 ha | under 1 ha | 5 ha |
| 2015 | 7 ha | under 1 ha | 7 ha |
| 2016 | 3 ha | under 1 ha | 3 ha |
| 2017 | 3 ha | under 1 ha | 3 ha |
| 2018 | 1 ha | under 1 ha | 1 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 6 ha | under 1 ha | 6 ha |
| 2021 | 8 ha | under 1 ha | 8 ha |
| 2022 | 6 ha | under 1 ha | 6 ha |
| 2023 | 8 ha | under 1 ha | 8 ha |
| 2024 | 2 ha | under 1 ha | 2 ha |
| 2025 | 3 ha | under 1 ha | 4 ha |
What is causing deforestation around Udon Thani?
- Farms, pasture and plantationscleared for good53% · 51 ha
- Towns and roadscleared for good37% · 35 ha
- Mining and energycleared for good9.2% · 9 ha
Also: 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
- 4,670 ha
- Forest in 2020
- 5,750 ha
- Overall change
- +1,080 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Udon Thani grew from about 4,670 hectares to 5,750 hectares, a net gain of about 1,080 hectares (+23%). New forest grew on about 1,370 hectares, while 284 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 Udon Thani
Same 2 km radius, same index — so they compare directly.
- Vientiane64.4 km
Laos
- Tree cover
- 28%
- Air quality
- 115
- Khon Kaen107.9 km
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- Tree cover
- 31%
- Air quality
- 63
- Thakhèk217.0 km
Laos
- Tree cover
- 50%
- Air quality
- 82
- Savannakhet230.2 km
Laos
- Tree cover
- 30%
- Air quality
- 55
- Nakhon Ratchasima281.5 km
Thailand
- Tree cover
- 24%
- Air quality
- 58
- Ubon Ratchathani327.2 km
Thailand
- Tree cover
- 30%
- Air quality
- 39
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Frequently asked
Questions about Udon Thani
What is the air quality (AQI) in Udon Thani right now?
The latest reading for Udon Thani shows an AQI of 51 (Moderate), measured Nov 11, 22:00 local time by the Nong Prajak Public Park, Udon Thani ground monitoring station, 600 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 Udon Thani today?
At AQI 51 (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 Udon Thani been like this week?
Over the last 7 days, the CAMS air-quality model put Udon Thani's daily AQI at 23 on average, from 13 on Nov 10 to an hourly peak of 44 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Udon Thani lost since 2001?
Since 2001, the area within 10 km of Udon Thani has lost about 96 hectares of forest (about 130 football pitches): 19% of the forest it had in 2000. Most of it (99%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Udon Thani grew from about 4,670 hectares to 5,750 hectares, a net gain of about 1,080 hectares (+23%). New forest grew on about 1,370 hectares, while 284 hectares were lost.
What is the tree count in Udon Thani?
Udon Thani has an estimated 83,211 trees across the 12.33 km² of land measured — 27.0% tree cover, 3 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Udon Thani need?
Udon Thani needs roughly 9,246 more trees to close a 3-point shortfall against its 30% tree-cover target — about 203.4 t of extra CO₂ absorbed per year once grown.
How are Udon Thani's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Mak Khaeng Sub-district, 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 Mak Khaeng Sub-district; the tree count is an estimate derived from that cover.
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