City report · Santiago Metropolitan, Chile
San Bernardo Air quality today
Air quality in San Bernardo currently reads AQI 70 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 70
Moderate
- PM2.5, fine particles (µg/m³)
- 22.8
- tree cover
- 6.8%
- trees in this area
- 21.4K
- more trees needed
- 72.9K
Measured across a 2 km radius around San Bernardo, Santiago Metropolitan Region, Chile (12.57 km²), from a satellite image of Mar 13, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
San Bernardo · AQI 70 (Moderate)
San Bernardo's tree count comes to 21,363 trees across 12.57 km², 23 points below the 30% tree-cover level considered healthy for this area, so roughly 72,885 more trees would close the gap.
Air quality detail
Air quality in San Bernardo today: AQI 70, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 22:00 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
22.8
PM10
23.2
NO₂
65.7
O₃
18.0
SO₂
23.2
CO
1023.0
- 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 San Bernardo's daily AQI at 71 on average, from 44 on Nov 6 to an hourly peak of 130 on Nov 5.
Where San Bernardo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in San Bernardo: Critically low
6.8% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
21,363
Target trees
94,248
More trees needed
72,885
CO₂ if planted / yr
1,603 t
Deforestation · 2001–2025
How much forest has San Bernardo lost?
Since 2001, the area within 10 km of San Bernardo has lost about 32 hectares of forest (about 45 football pitches): 11% of the forest it had in 2000. Most of it (80%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from March 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 32 haabout 45 football pitches
- Share of its forest
- 11%of what there was in 2000
- Cleared for good
- 26 hadeforestation: turned into farms, mines or towns
The worst year was 2002, when about 13 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 | 2 ha | under 1 ha | 2 ha |
| 2002 | 12 ha | under 1 ha | 13 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | 1 ha |
| 2005 | under 1 ha | under 1 ha | 1 ha |
| 2006 | 1 ha | under 1 ha | 2 ha |
| 2007 | under 1 ha | under 1 ha | 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | 2 ha | under 1 ha | 2 ha |
| 2010 | 3 ha | under 1 ha | 3 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | 1 ha | 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 3 ha | under 1 ha | 3 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 San Bernardo?
- Farms, pasture and plantationscleared for good68% · 22 ha
- Towns and roadscleared for good13% · 4 ha
- Loggingcan grow back2.5% · under 1 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
- 149 ha
- Forest in 2020
- 183 ha
- Overall change
- +34 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around San Bernardo grew from about 149 hectares to 183 hectares, a net gain of about 34 hectares (+23%). New forest grew on about 41 hectares, while 7 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 San Bernardo
What is the air quality (AQI) in San Bernardo right now?
The latest reading for San Bernardo shows an AQI of 70 (Moderate), observed Nov 10, 22:00 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 San Bernardo today?
At AQI 70 (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 San Bernardo been like this week?
Over the last 7 days, the CAMS air-quality model put San Bernardo's daily AQI at 71 on average, from 44 on Nov 6 to an hourly peak of 130 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around San Bernardo lost since 2001?
Since 2001, the area within 10 km of San Bernardo has lost about 32 hectares of forest (about 45 football pitches): 11% of the forest it had in 2000. Most of it (80%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around San Bernardo grew from about 149 hectares to 183 hectares, a net gain of about 34 hectares (+23%). New forest grew on about 41 hectares, while 7 hectares were lost.
What is the tree count in San Bernardo?
San Bernardo has an estimated 21,363 trees across the 12.57 km² measured — 6.8% tree cover, 23 percentage points short of the 30% tree-cover target set for this area.
How many more trees does San Bernardo need?
San Bernardo needs roughly 72,885 more trees to close a 23-point shortfall against its 30% tree-cover target — about 1,603 t of extra CO₂ absorbed per year once grown.
How are San Bernardo'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 San Bernardo; the tree count is an estimate derived from that cover.
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