City report · Calabarzon, Philippines
San Mateo Air quality today
Air quality in San Mateo currently reads AQI 68 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 68
Moderate
- PM2.5, fine particles (µg/m³)
- 18.0
- tree cover
- 35.3%
- trees in this area
- 111K
- more trees needed
- 0
Measured across a 2 km radius around Guitnang Bayan II, San Mateo, Rizal, Philippines (12.57 km²), from a satellite image of Sep 13, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
San Mateo · AQI 68 (Moderate)
San Mateo's tree count comes to 110,787 trees across 12.56 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in San Mateo today: AQI 68, Moderate
Main pollutant: PM2.5 · Observed Nov 12, 00:04 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Tivoli, 3.8 km away · median of 6 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
18.0
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, Clarity, CS, Manila Observatory
- 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 Mateo's daily AQI at 29 on average, from 17 on Nov 9 to an hourly peak of 53 on Nov 10.
Where San Mateo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in San Mateo: Healthy tree cover
35.3% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
110,787
Target trees
110,787
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has San Mateo lost?
Since 2001, the area within 10 km of San Mateo has lost about 452 hectares of forest (about 630 football pitches): 4.4% of the forest it had in 2000. Most of it (84%) was deforestation, forest cleared for good, mainly for mining and energy.
2017: satellite photo from March 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 452 haabout 630 football pitches
- Share of its forest
- 4.4%of what there was in 2000
- Cleared for good
- 379 hadeforestation: turned into farms, mines or towns
The worst year was 2022, when about 60 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 | 8 ha | 3 ha | 11 ha |
| 2002 | 7 ha | 4 ha | 11 ha |
| 2003 | 3 ha | 5 ha | 9 ha |
| 2004 | 7 ha | 3 ha | 9 ha |
| 2005 | 12 ha | 1 ha | 13 ha |
| 2006 | 13 ha | 2 ha | 15 ha |
| 2007 | 20 ha | 3 ha | 23 ha |
| 2008 | 5 ha | under 1 ha | 5 ha |
| 2009 | 23 ha | 3 ha | 25 ha |
| 2010 | 22 ha | 4 ha | 26 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 16 ha | under 1 ha | 17 ha |
| 2013 | 7 ha | 2 ha | 9 ha |
| 2014 | 15 ha | under 1 ha | 16 ha |
| 2015 | 5 ha | under 1 ha | 5 ha |
| 2016 | 17 ha | 4 ha | 21 ha |
| 2017 | 14 ha | 3 ha | 16 ha |
| 2018 | 13 ha | 2 ha | 14 ha |
| 2019 | 16 ha | under 1 ha | 16 ha |
| 2020 | 22 ha | under 1 ha | 22 ha |
| 2021 | 11 ha | 1 ha | 13 ha |
| 2022 | 58 ha | 2 ha | 60 ha |
| 2023 | 17 ha | 1 ha | 18 ha |
| 2024 | 28 ha | 23 ha | 52 ha |
| 2025 | 21 ha | 5 ha | 25 ha |
What is causing deforestation around San Mateo?
- Mining and energycleared for good45% · 202 ha
- Towns and roadscleared for good28% · 127 ha
- Shifting farmingcan grow back13% · 57 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
- 16,200 ha
- Forest in 2020
- 16,000 ha
- Overall change
- −203 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around San Mateo stayed about the same size, at about 16,000 hectares: new forest grew on about 267 hectares, and about 471 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 San Mateo
Same 2 km radius, same index — so they compare directly.
- San Jose del Monte15.4 km
Philippines
- Tree cover
- 54%
- Air quality
- 90
- Valenzuela16.9 km
Philippines
- Tree cover
- 14%
- Air quality
- 91
- Manila18.5 km
Philippines
- Tree cover
- 10%
- Air quality
- 54
- Angono19.4 km
Philippines
- Tree cover
- 30%
- Air quality
- 53
- Taguig19.9 km
Philippines
- Tree cover
- 32%
- Air quality
- 52
- Norzagaray25.0 km
Philippines
- Tree cover
- 71%
- Air quality
- 92
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Frequently asked
Questions about San Mateo
What is the air quality (AQI) in San Mateo right now?
The latest reading for San Mateo shows an AQI of 68 (Moderate), measured Nov 12, 00:04 local time by 6 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Tivoli, 3.8 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in San Mateo today?
At AQI 68 (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 Mateo been like this week?
Over the last 7 days, the CAMS air-quality model put San Mateo's daily AQI at 29 on average, from 17 on Nov 9 to an hourly peak of 53 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around San Mateo lost since 2001?
Since 2001, the area within 10 km of San Mateo has lost about 452 hectares of forest (about 630 football pitches): 4.4% of the forest it had in 2000. Most of it (84%) was deforestation, forest cleared for good, mainly for mining and energy. Comparing satellite maps from 2000 and 2020, the forest around San Mateo stayed about the same size, at about 16,000 hectares: new forest grew on about 267 hectares, and about 471 hectares were lost.
What is the tree count in San Mateo?
San Mateo has an estimated 110,787 trees across the 12.56 km² of land measured — 35.3% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does San Mateo need?
San Mateo has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are San Mateo's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Guitnang Bayan II, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. 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 Guitnang Bayan II; the tree count is an estimate derived from that cover.
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