City report · Cagayan Valley, Philippines
Santiago Air quality today
Air quality in Santiago currently reads AQI 65 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 65
Moderate
- PM2.5, fine particles (µg/m³)
- 18.1
- tree cover
- 36.5%
- trees in this area
- 115K
- more trees needed
- 0
Measured across a 2 km radius around Centro East, City of Santiago, Isabela, Philippines (12.57 km²), from a satellite image of May 26, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Santiago · AQI 65 (Moderate)
Santiago's tree count comes to 114,668 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Santiago today: AQI 65, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 07:00 local time via Open-Meteo / CAMS, corrected with 15 ground-station cities within 250 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 15 station cities within 250 km, e.g. Angeles and Norzagaray
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
18.1
PM10
7.0
NO₂
4.8
O₃
51.0
SO₂
1.7
CO
180.0
- 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 48 on average, from 25 on Nov 9 to an hourly peak of 96 on Nov 7.
Where Santiago stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Santiago: Healthy tree cover
36.5% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
114,668
Target trees
114,668
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Santiago lost?
Since 2001, the area within 10 km of Santiago has lost about 208 hectares of forest (about 290 football pitches): 7.1% of the forest it had in 2000. Most of it (95%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 208 haabout 290 football pitches
- Share of its forest
- 7.1%of what there was in 2000
- Cleared for good
- 196 hadeforestation: turned into farms, mines or towns
The worst year was 2010, when about 50 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 | 5 ha | 2 ha | 7 ha |
| 2002 | 7 ha | 1 ha | 8 ha |
| 2003 | 12 ha | under 1 ha | 12 ha |
| 2004 | 1 ha | under 1 ha | 1 ha |
| 2005 | 14 ha | 2 ha | 16 ha |
| 2006 | 6 ha | under 1 ha | 6 ha |
| 2007 | 10 ha | 1 ha | 12 ha |
| 2008 | 2 ha | under 1 ha | 2 ha |
| 2009 | 37 ha | 1 ha | 38 ha |
| 2010 | 48 ha | 2 ha | 50 ha |
| 2011 | 4 ha | under 1 ha | 4 ha |
| 2012 | 11 ha | under 1 ha | 11 ha |
| 2013 | 3 ha | under 1 ha | 3 ha |
| 2014 | 5 ha | under 1 ha | 5 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 | 13 ha | under 1 ha | 13 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 2 ha | under 1 ha | 2 ha |
| 2021 | 2 ha | under 1 ha | 2 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | 2 ha | under 1 ha | 2 ha |
| 2024 | 4 ha | under 1 ha | 4 ha |
| 2025 | 5 ha | under 1 ha | 6 ha |
What is causing deforestation around Santiago?
- Farms, pasture and plantationscleared for good91% · 189 ha
- Towns and roadscleared for good3.2% · 7 ha
- Unknown causescause unknown5.6% · 12 ha
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
- 3,740 ha
- Forest in 2020
- 3,700 ha
- Overall change
- −41 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Santiago stayed about the same size, at about 3,700 hectares: new forest grew on about 180 hectares, and about 221 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.
- Ilagan62.7 km
Philippines
- Tree cover
- 8%
- Air quality
- 17
- Tabuk87.8 km
Philippines
- Tree cover
- 26%
- Air quality
- 27
- Tuguegarao104.8 km
Philippines
- Tree cover
- 33%
- Air quality
- 27
- Baguio106.2 km
Philippines
- Tree cover
- 34%
- Air quality
- 74
- Urdaneta131.0 km
Philippines
- Tree cover
- 47%
- Air quality
- 161
- Cabanatuan City147.4 km
Philippines
- Tree cover
- 31%
- Air quality
- 59
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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 65 (Moderate), observed Nov 11, 07:00 local time via Open-Meteo / CAMS, corrected with 15 ground-station cities within 250 km, 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 65 (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 48 on average, from 25 on Nov 9 to an hourly peak of 96 on Nov 7. 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?
Since 2001, the area within 10 km of Santiago has lost about 208 hectares of forest (about 290 football pitches): 7.1% of the forest it had in 2000. Most of it (95%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Santiago stayed about the same size, at about 3,700 hectares: new forest grew on about 180 hectares, and about 221 hectares were lost.
What is the tree count in Santiago?
Santiago has an estimated 114,668 trees across the 12.57 km² measured — 36.5% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Santiago need?
Santiago has already reached its tree-cover target, so no additional trees are needed to close the gap.
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 Centro East; the tree count is an estimate derived from that cover.
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