City report · Mongolia
Nalayh Air quality today
Air quality in Nalayh currently reads AQI 25 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 25
Good
- PM2.5, fine particles (µg/m³)
- 6.0
- tree cover
- 0%
- trees in this area
- 0
- more trees needed
- 94.2K
Measured across a 2 km radius around Nalaikh, Ulaanbaatar, Mongolia (12.57 km²), from a satellite image of Sep 15, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Nalayh · AQI 25 (Good)
Nalayh's tree count comes to 0 trees across 12.57 km², 30 points below the 30% tree-cover level considered healthy for this area, so roughly 94,248 more trees would close the gap.
Air quality detail
Air quality in Nalayh today: AQI 25, Good
Main pollutant: PM2.5 · Observed Nov 11, 17:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.0
PM10
6.2
NO₂
8.1
O₃
62.0
SO₂
11.3
CO
468.0
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Nalayh's daily AQI at 36 on average, from 21 on Nov 10 to an hourly peak of 82 on Nov 8.
Where Nalayh stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Nalayh: Critically low
0% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
0
Target trees
94,248
More trees needed
94,248
CO₂ if planted / yr
2,073 t
Deforestation · 2001–2025
How much forest has Nalayh lost?
Since 2001, the area within 10 km of Nalayh has lost about 172 hectares of forest (about 240 football pitches): 69% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. Almost none of it was deforestation, meaning forest cleared for good.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 172 haabout 240 football pitches
- Share of its forest
- 69%of what there was in 2000
- Cleared for good
- under 1 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 92 hectares of forest were lost, mostly to wildfires.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | 92 ha | 92 ha |
| 2002 | under 1 ha | 18 ha | 18 ha |
| 2003 | under 1 ha | 5 ha | 5 ha |
| 2004 | under 1 ha | 2 ha | 2 ha |
| 2005 | under 1 ha | 9 ha | 9 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | 18 ha | 18 ha |
| 2008 | under 1 ha | 2 ha | 2 ha |
| 2009 | under 1 ha | 11 ha | 11 ha |
| 2010 | under 1 ha | 13 ha | 13 ha |
| 2011 | under 1 ha | 2 ha | 2 ha |
| 2012 | under 1 ha | under 1 ha | under 1 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 Nalayh?
- Wildfirescan grow back91% · 156 ha
- Storms, floods and other natural causescan grow back8.1% · 14 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
- 182 ha
- Forest in 2020
- 181 ha
- Overall change
- −1 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Nalayh stayed about the same size, at about 181 hectares: new forest grew on about 9 hectares, and about 10 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 Nalayh
What is the air quality (AQI) in Nalayh right now?
The latest reading for Nalayh shows an AQI of 25 (Good), observed Nov 11, 17:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Nalayh today?
At AQI 25 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Nalayh been like this week?
Over the last 7 days, the CAMS air-quality model put Nalayh's daily AQI at 36 on average, from 21 on Nov 10 to an hourly peak of 82 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 Nalayh lost since 2001?
Since 2001, the area within 10 km of Nalayh has lost about 172 hectares of forest (about 240 football pitches): 69% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. Almost none of it was deforestation, meaning forest cleared for good. Comparing satellite maps from 2000 and 2020, the forest around Nalayh stayed about the same size, at about 181 hectares: new forest grew on about 9 hectares, and about 10 hectares were lost.
What is the tree count in Nalayh?
Nalayh has an estimated 0 trees across the 12.57 km² measured — 0% tree cover, 30 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Nalayh need?
Nalayh needs roughly 94,248 more trees to close a 30-point shortfall against its 30% tree-cover target — about 2,073 t of extra CO₂ absorbed per year once grown.
How are Nalayh'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 Nalaikh; the tree count is an estimate derived from that cover.
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