City report · Bangkok, Thailand
Sai Mai Air quality today
Air quality in Sai Mai currently reads AQI 57 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 57
Moderate
- PM2.5, fine particles (µg/m³)
- 12.5
- tree cover
- 18.4%
- trees in this area
- 57.7K
- more trees needed
- 36.4K
Measured across a 2 km radius around Sai Mai, Bangkok, Thailand (12.57 km²), from a satellite image of Aug 3, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Sai Mai · AQI 57 (Moderate)
Sai Mai's tree count comes to 57,690 trees across 12.54 km² of land, 12 points below the 30% tree-cover level considered healthy for this area, so roughly 36,370 more trees would close the gap.
Air quality detail
Air quality in Sai Mai today: AQI 57, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 22:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Ramintra Sports Park, 5.5 km away · median of 6 stations
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
12.5
PM10
29.0
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · Air4Thai, Pollution Control Department, Thailand · Air4Thai
- 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 Sai Mai's daily AQI at 61 on average, from 28 on Nov 10 to an hourly peak of 104 on Nov 4.
Where Sai Mai stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Sai Mai: Below target
18.4% tree cover against a 30% healthy-neighborhood target, across 12.54 km² of land.
Trees in this area
57,690
Target trees
94,060
More trees needed
36,370
CO₂ if planted / yr
800.1 t
Deforestation · 2001–2025
How much forest has Sai Mai lost?
Since 2001, the area within 10 km of Sai Mai has lost about 24 hectares of forest (about 34 football pitches): 4.4% of the forest it had in 2000. The biggest cause was towns and roads (35%). About 9 hectares (36%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from February 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 24 haabout 34 football pitches
- Share of its forest
- 4.4%of what there was in 2000
- Cleared for good
- 9 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 5 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 | 1 ha | 4 ha | 5 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 2 ha | 2 ha | 4 ha |
| 2005 | under 1 ha | under 1 ha | 1 ha |
| 2006 | 1 ha | 1 ha | 3 ha |
| 2007 | under 1 ha | 1 ha | 2 ha |
| 2008 | 1 ha | under 1 ha | 2 ha |
| 2009 | under 1 ha | 1 ha | 1 ha |
| 2010 | under 1 ha | 2 ha | 2 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 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 Sai Mai?
- Towns and roadscleared for good35% · 9 ha
- Unknown causescause unknown65% · 16 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
- 2,620 ha
- Forest in 2020
- 2,800 ha
- Overall change
- +186 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Sai Mai grew from about 2,620 hectares to 2,800 hectares, a net gain of about 186 hectares (+7.1%). New forest grew on about 257 hectares, while 71 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 Sai Mai
Same 2 km radius, same index — so they compare directly.
- Bueng Kum15.3 km
Thailand
- Tree cover
- 33%
- Air quality
- 58
- Mueang Nonthaburi15.6 km
Thailand
- Tree cover
- 31%
- Air quality
- 57
- Khlong Luang16.0 km
Thailand
- Tree cover
- 35%
- Air quality
- 66
- Watthana22.2 km
Thailand
- Tree cover
- 23%
- Air quality
- 58
- Latkrabang24.0 km
Thailand
- Tree cover
- 37%
- Air quality
- 58
- Bangkok24.2 km
Thailand
- Tree cover
- 12%
- Air quality
- 58
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Frequently asked
Questions about Sai Mai
What is the air quality (AQI) in Sai Mai right now?
The latest reading for Sai Mai shows an AQI of 57 (Moderate), measured Nov 11, 22:00 local time by 6 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Ramintra Sports Park, 5.5 km away). The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Sai Mai today?
At AQI 57 (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 Sai Mai been like this week?
Over the last 7 days, the CAMS air-quality model put Sai Mai's daily AQI at 61 on average, from 28 on Nov 10 to an hourly peak of 104 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 Sai Mai lost since 2001?
Since 2001, the area within 10 km of Sai Mai has lost about 24 hectares of forest (about 34 football pitches): 4.4% of the forest it had in 2000. The biggest cause was towns and roads (35%). About 9 hectares (36%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Sai Mai grew from about 2,620 hectares to 2,800 hectares, a net gain of about 186 hectares (+7.1%). New forest grew on about 257 hectares, while 71 hectares were lost.
What is the tree count in Sai Mai?
Sai Mai has an estimated 57,690 trees across the 12.54 km² of land measured — 18.4% tree cover, 12 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Sai Mai need?
Sai Mai needs roughly 36,370 more trees to close a 12-point shortfall against its 30% tree-cover target — about 800.1 t of extra CO₂ absorbed per year once grown.
How are Sai Mai's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Sai Mai, 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 Sai Mai; the tree count is an estimate derived from that cover.
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