City report · Prachin Buri, Thailand
Si Maha Phot Air quality today
Air quality in Si Maha Phot currently reads AQI 61 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 61
Moderate
- PM2.5, fine particles (µg/m³)
- 14.4
- tree cover
- 49.3%
- trees in this area
- 155K
- more trees needed
- 0
Measured across a 2 km radius around Si Maha Phot, Si Maha Phot District, Prachin Buri, Thailand (12.57 km²), from a satellite image of Jul 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Si Maha Phot · AQI 61 (Moderate)
Si Maha Phot's tree count comes to 154,881 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 Si Maha Phot today: AQI 61, 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 · Bu Yai Bai Hall Station, 9.9 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
14.4
PM10
—
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 Si Maha Phot's daily AQI at 42 on average, from 19 on Nov 10 to an hourly peak of 76 on Nov 4.
Where Si Maha Phot stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Si Maha Phot: Healthy tree cover
49.3% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
154,881
Target trees
154,881
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Si Maha Phot lost?
Since 2001, the area within 10 km of Si Maha Phot has lost about 293 hectares of forest (about 410 football pitches): 12% of the forest it had in 2000. Most of it (96%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km northeast of the city center.
- Forest lost since 2001
- 293 haabout 410 football pitches
- Share of its forest
- 12%of what there was in 2000
- Cleared for good
- 282 hadeforestation: turned into farms, mines or towns
The worst year was 2023, when about 34 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 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 6 ha | under 1 ha | 6 ha |
| 2004 | 1 ha | under 1 ha | 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 3 ha | under 1 ha | 3 ha |
| 2007 | 4 ha | under 1 ha | 4 ha |
| 2008 | 7 ha | under 1 ha | 7 ha |
| 2009 | 6 ha | under 1 ha | 6 ha |
| 2010 | 10 ha | under 1 ha | 10 ha |
| 2011 | 15 ha | under 1 ha | 16 ha |
| 2012 | 18 ha | under 1 ha | 18 ha |
| 2013 | 7 ha | under 1 ha | 7 ha |
| 2014 | 6 ha | under 1 ha | 6 ha |
| 2015 | 9 ha | under 1 ha | 10 ha |
| 2016 | 23 ha | 1 ha | 24 ha |
| 2017 | 24 ha | 3 ha | 28 ha |
| 2018 | 6 ha | under 1 ha | 6 ha |
| 2019 | 11 ha | under 1 ha | 12 ha |
| 2020 | 16 ha | under 1 ha | 16 ha |
| 2021 | 23 ha | under 1 ha | 24 ha |
| 2022 | 15 ha | under 1 ha | 15 ha |
| 2023 | 33 ha | under 1 ha | 34 ha |
| 2024 | 27 ha | under 1 ha | 28 ha |
| 2025 | 12 ha | 1 ha | 13 ha |
What is causing deforestation around Si Maha Phot?
- Farms, pasture and plantationscleared for good83% · 244 ha
- Towns and roadscleared for good13% · 37 ha
- Loggingcan grow back2.2% · 7 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
- 4,300 ha
- Forest in 2020
- 3,580 ha
- Overall change
- −712 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Si Maha Phot shrank from about 4,300 hectares to 3,580 hectares, a net loss of about 712 hectares (−17%). New forest grew on about 325 hectares, but 1,040 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 Si Maha Phot
Same 2 km radius, same index — so they compare directly.
- Kabin Buri22.1 km
Thailand
- Tree cover
- 64%
- Air quality
- 61
- Nong Chok71.3 km
Thailand
- Tree cover
- 50%
- Air quality
- 51
- Khlong Sam Wa84.4 km
Thailand
- Tree cover
- 55%
- Air quality
- 62
- Latkrabang87.0 km
Thailand
- Tree cover
- 37%
- Air quality
- 58
- Chon Buri88.2 km
Thailand
- Tree cover
- 22%
- Air quality
- 64
- Bueng Kum93.3 km
Thailand
- Tree cover
- 33%
- Air quality
- 58
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Frequently asked
Questions about Si Maha Phot
What is the air quality (AQI) in Si Maha Phot right now?
The latest reading for Si Maha Phot shows an AQI of 61 (Moderate), measured Nov 11, 22:00 local time by the Bu Yai Bai Hall Station ground monitoring station, 9.9 km away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Si Maha Phot today?
At AQI 61 (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 Si Maha Phot been like this week?
Over the last 7 days, the CAMS air-quality model put Si Maha Phot's daily AQI at 42 on average, from 19 on Nov 10 to an hourly peak of 76 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 Si Maha Phot lost since 2001?
Since 2001, the area within 10 km of Si Maha Phot has lost about 293 hectares of forest (about 410 football pitches): 12% of the forest it had in 2000. Most of it (96%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Si Maha Phot shrank from about 4,300 hectares to 3,580 hectares, a net loss of about 712 hectares (−17%). New forest grew on about 325 hectares, but 1,040 hectares were lost.
What is the tree count in Si Maha Phot?
Si Maha Phot has an estimated 154,881 trees across the 12.57 km² measured — 49.3% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Si Maha Phot need?
Si Maha Phot has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Si Maha Phot's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Si Maha Phot, 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 Si Maha Phot; the tree count is an estimate derived from that cover.
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