City report · Chile
Chillán Air quality today
Air quality in Chillán currently reads AQI 55 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 55
Moderate
- PM2.5, fine particles (µg/m³)
- 11.2
- tree cover
- 10.9%
- trees in this area
- 34.2K
- more trees needed
- 60.0K
Measured across a 2 km radius around Chillán, Ñuble, Chile (12.57 km²), from a satellite image of Mar 13, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Chillán · AQI 55 (Moderate)
Chillán's tree count comes to 34,243 trees across 12.57 km², 19 points below the 30% tree-cover level considered healthy for this area, so roughly 60,004 more trees would close the gap.
Air quality detail
Air quality in Chillán today: AQI 55, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 23:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
11.2
PM10
11.9
NO₂
9.1
O₃
42.0
SO₂
2.9
CO
334.0
- 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 Chillán's daily AQI at 29 on average, from 16 on Nov 6 to an hourly peak of 60 on Nov 4.
Where Chillán stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Chillán: Critically low
10.9% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
34,243
Target trees
94,247
More trees needed
60,004
CO₂ if planted / yr
1,320 t
Deforestation · 2001–2025
How much forest has Chillán lost?
Since 2001, the area within 10 km of Chillán has lost about 2,040 hectares of forest (about 2,900 football pitches): 28% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 334 hectares (16%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km south of the city center.
- Forest lost since 2001
- 2,040 haabout 2,900 football pitches
- Share of its forest
- 28%of what there was in 2000
- Cleared for good
- 334 hadeforestation: turned into farms, mines or towns
Forest loss has stayed about the same: about 64 hectares a year in 2021–2025, against 69 hectares a year in 2016–2020. The worst year was 2010, when about 296 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 | 9 ha | 16 ha | 25 ha |
| 2002 | 15 ha | 43 ha | 58 ha |
| 2003 | 14 ha | 18 ha | 32 ha |
| 2004 | 9 ha | 39 ha | 48 ha |
| 2005 | 19 ha | 13 ha | 31 ha |
| 2006 | 7 ha | 11 ha | 18 ha |
| 2007 | 26 ha | 41 ha | 67 ha |
| 2008 | 36 ha | 42 ha | 78 ha |
| 2009 | 13 ha | 108 ha | 121 ha |
| 2010 | 13 ha | 284 ha | 296 ha |
| 2011 | 18 ha | 61 ha | 78 ha |
| 2012 | 31 ha | 87 ha | 118 ha |
| 2013 | 9 ha | 178 ha | 187 ha |
| 2014 | 17 ha | 123 ha | 140 ha |
| 2015 | 4 ha | 81 ha | 85 ha |
| 2016 | 12 ha | 84 ha | 96 ha |
| 2017 | 22 ha | 113 ha | 135 ha |
| 2018 | 3 ha | 32 ha | 35 ha |
| 2019 | 7 ha | 16 ha | 24 ha |
| 2020 | 10 ha | 42 ha | 53 ha |
| 2021 | 20 ha | 60 ha | 80 ha |
| 2022 | 8 ha | 68 ha | 76 ha |
| 2023 | 4 ha | 109 ha | 113 ha |
| 2024 | 5 ha | 33 ha | 38 ha |
| 2025 | 4 ha | 9 ha | 12 ha |
What is causing deforestation around Chillán?
- Loggingcan grow back78% · 1,600 ha
- Farms, pasture and plantationscleared for good13% · 275 ha
- Wildfirescan grow back3.1% · 64 ha
Also: towns and roads, storms, floods and other natural causes, 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
- 3,620 ha
- Forest in 2020
- 3,580 ha
- Overall change
- −37 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Chillán stayed about the same size, at about 3,580 hectares: new forest grew on about 1,070 hectares, and about 1,110 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 Chillán
Same 2 km radius, same index — so they compare directly.
- Concepción87.8 km
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- Tree cover
- 28%
- Air quality
- 48
- Villa Mercedes89.4 km
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- Tree cover
- 33%
- Air quality
- 29
- Talcahuano91.3 km
Chile
- Tree cover
- 19%
- Air quality
- 48
- Los Ángeles98.5 km
Chile
- Tree cover
- 15%
- Air quality
- 58
- Coronel103.8 km
Chile
- Tree cover
- 36%
- Air quality
- 44
- Talca137.8 km
Chile
- Tree cover
- 11%
- Air quality
- 38
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Frequently asked
Questions about Chillán
What is the air quality (AQI) in Chillán right now?
The latest reading for Chillán shows an AQI of 55 (Moderate), observed Nov 10, 23:00 local time via Open-Meteo / CAMS, 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 Chillán 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 Chillán been like this week?
Over the last 7 days, the CAMS air-quality model put Chillán's daily AQI at 29 on average, from 16 on Nov 6 to an hourly peak of 60 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Chillán lost since 2001?
Since 2001, the area within 10 km of Chillán has lost about 2,040 hectares of forest (about 2,900 football pitches): 28% of the forest it had in 2000. Most of it was lost to logging, so much of it can grow back. About 334 hectares (16%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss has stayed about the same: about 64 hectares a year in 2021–2025, against 69 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Chillán stayed about the same size, at about 3,580 hectares: new forest grew on about 1,070 hectares, and about 1,110 hectares were lost.
What is the tree count in Chillán?
Chillán has an estimated 34,243 trees across the 12.57 km² measured — 10.9% tree cover, 19 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Chillán need?
Chillán needs roughly 60,004 more trees to close a 19-point shortfall against its 30% tree-cover target — about 1,320 t of extra CO₂ absorbed per year once grown.
How are Chillán'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 Chillán; the tree count is an estimate derived from that cover.
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