City report · Santiago Metropolitan, Chile
Santiago Air quality today
Air quality in Santiago currently reads AQI 64 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 64
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 19.2
- tree cover
- 8.8%
- trees in this area
- 27.6K
- more trees needed
- 66.5K
Measured across a 2 km radius around Santiago, 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.
Santiago · AQI 64 (Moderate)
Santiago's tree count comes to 27,618 trees across 12.56 km² of land, 21 points below the 30% tree-cover level considered healthy for this area, so roughly 66,535 more trees would close the gap.
Air quality detail
Air quality in Santiago today: AQI 64, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 21:00 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
19.2
PM10
19.5
NO₂
60.9
O₃
28.0
SO₂
20.9
CO
1271.0
- 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 Santiago's daily AQI at 71 on average, from 44 on Nov 6 to an hourly peak of 130 on Nov 5.
Where Santiago stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Santiago: Critically low
8.8% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
27,618
Target trees
94,153
More trees needed
66,535
CO₂ if planted / yr
1,464 t
Deforestation · 2001–2025
How much forest has Santiago lost?
There was almost no forest around Santiago in 2000, so there has been almost nothing to lose since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
2017: satellite photo from March 2017 of a 5 × 5 km area in the city center.
Forest gained and lost, 2000–2020
- Forest in 2000
- 200 ha
- Forest in 2020
- 244 ha
- Overall change
- +44 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Santiago grew from about 200 hectares to 244 hectares, a net gain of about 44 hectares (+22%). New forest grew on about 47 hectares, while 2 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 Santiago
Same 2 km radius, same index — so they compare directly.
- Maipú12.6 km
Chile
- Tree cover
- 8%
- Air quality
- 70
- San Bernardo15.8 km
Chile
- Tree cover
- 7%
- Air quality
- 70
- Puente Alto18.5 km
Chile
- Tree cover
- 8%
- Air quality
- 58
- Colina28.2 km
Chile
- Tree cover
- 7%
- Air quality
- 65
- Lampa28.4 km
Chile
- Tree cover
- 11%
- Air quality
- 65
- Rancagua79.6 km
Chile
- Tree cover
- 7%
- Air quality
- 39
Also compared:Santiago vs AntofagastaSantiago vs Viña del MarSantiago vs Puerto MonttSantiago vs Arica
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Frequently asked
Questions about Santiago
What is the air quality (AQI) in Santiago right now?
The latest reading for Santiago shows an AQI of 64 (Moderate), observed Nov 10, 21:00 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 Santiago today?
At AQI 64 (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 Santiago been like this week?
Over the last 7 days, the CAMS air-quality model put Santiago'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 Santiago lost since 2001?
There was almost no forest around Santiago in 2000, so there has been almost nothing to lose since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here. Comparing satellite maps from 2000 and 2020, the forest around Santiago grew from about 200 hectares to 244 hectares, a net gain of about 44 hectares (+22%). New forest grew on about 47 hectares, while 2 hectares were lost.
What is the tree count in Santiago?
Santiago has an estimated 27,618 trees across the 12.56 km² of land measured — 8.8% tree cover, 21 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Santiago need?
Santiago needs roughly 66,535 more trees to close a 21-point shortfall against its 30% tree-cover target — about 1,464 t of extra CO₂ absorbed per year once grown.
How are Santiago'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 Santiago; the tree count is an estimate derived from that cover.
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