City report · Chon Buri, Thailand
Si Racha Air quality today
Air quality in Si Racha currently reads AQI 51 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 51
Moderate
- PM2.5, fine particles (µg/m³)
- 9.3
- tree cover
- 39.0%
- trees in this area
- 90.5K
- more trees needed
- 0
Measured across a 2 km radius around Si Racha, Si Racha District, Chon 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 Racha · AQI 51 (Moderate)
Si Racha's tree count comes to 90,544 trees across 9.29 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Si Racha today: AQI 51, 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 · Laem Chabang Municipal Stadium, 6.1 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
9.3
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 Racha's daily AQI at 42 on average, from 25 on Nov 10 to an hourly peak of 67 on Nov 8.
Where Si Racha stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Si Racha: Healthy tree cover
39.0% tree cover against a 30% healthy-neighborhood target, across 9.29 km² of land.
Trees in this area
90,544
Target trees
90,544
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Si Racha lost?
Since 2001, the area within 10 km of Si Racha has lost about 261 hectares of forest (about 370 football pitches): 12% of the forest it had in 2000. Most of it (99%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from February 2017 of a 5 × 5 km area about 3 km northeast of the city center.
- Forest lost since 2001
- 261 haabout 370 football pitches
- Share of its forest
- 12%of what there was in 2000
- Cleared for good
- 258 hadeforestation: turned into farms, mines or towns
The worst year was 2024, when about 26 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 | 2 ha | under 1 ha | 2 ha |
| 2002 | 10 ha | under 1 ha | 10 ha |
| 2003 | 8 ha | under 1 ha | 8 ha |
| 2004 | 12 ha | under 1 ha | 12 ha |
| 2005 | 14 ha | under 1 ha | 15 ha |
| 2006 | 10 ha | under 1 ha | 11 ha |
| 2007 | 3 ha | under 1 ha | 3 ha |
| 2008 | 11 ha | under 1 ha | 11 ha |
| 2009 | 22 ha | under 1 ha | 22 ha |
| 2010 | 18 ha | under 1 ha | 18 ha |
| 2011 | 7 ha | under 1 ha | 8 ha |
| 2012 | 6 ha | under 1 ha | 6 ha |
| 2013 | 5 ha | under 1 ha | 5 ha |
| 2014 | 4 ha | under 1 ha | 4 ha |
| 2015 | 2 ha | under 1 ha | 2 ha |
| 2016 | 16 ha | under 1 ha | 16 ha |
| 2017 | 5 ha | under 1 ha | 5 ha |
| 2018 | 9 ha | under 1 ha | 9 ha |
| 2019 | 16 ha | under 1 ha | 16 ha |
| 2020 | 8 ha | under 1 ha | 8 ha |
| 2021 | 8 ha | under 1 ha | 8 ha |
| 2022 | 12 ha | under 1 ha | 12 ha |
| 2023 | 15 ha | under 1 ha | 15 ha |
| 2024 | 26 ha | under 1 ha | 26 ha |
| 2025 | 10 ha | under 1 ha | 10 ha |
What is causing deforestation around Si Racha?
- Towns and roadscleared for good84% · 220 ha
- Farms, pasture and plantationscleared for good13% · 34 ha
- Mining and energycleared for good1.3% · 4 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
- 5,060 ha
- Forest in 2020
- 5,220 ha
- Overall change
- +160 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Si Racha grew from about 5,060 hectares to 5,220 hectares, a net gain of about 160 hectares (+3.2%). New forest grew on about 537 hectares, while 378 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 Racha
Same 2 km radius, same index — so they compare directly.
- Chon Buri21.8 km
Thailand
- Tree cover
- 22%
- Air quality
- 64
- Pattaya27.1 km
Thailand
- Tree cover
- 14%
- Air quality
- 51
- Samut Prakan59.5 km
Thailand
- Tree cover
- 31%
- Air quality
- 61
- Latkrabang64.9 km
Thailand
- Tree cover
- 37%
- Air quality
- 58
- Rayong65.1 km
Thailand
- Tree cover
- 34%
- Air quality
- 49
- Phra Pradaeng69.1 km
Thailand
- Tree cover
- 25%
- Air quality
- 58
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Frequently asked
Questions about Si Racha
What is the air quality (AQI) in Si Racha right now?
The latest reading for Si Racha shows an AQI of 51 (Moderate), measured Nov 11, 22:00 local time by the Laem Chabang Municipal Stadium ground monitoring station, 6.1 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 Racha today?
At AQI 51 (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 Racha been like this week?
Over the last 7 days, the CAMS air-quality model put Si Racha's daily AQI at 42 on average, from 25 on Nov 10 to an hourly peak of 67 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Si Racha lost since 2001?
Since 2001, the area within 10 km of Si Racha has lost about 261 hectares of forest (about 370 football pitches): 12% of the forest it had in 2000. Most of it (99%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Si Racha grew from about 5,060 hectares to 5,220 hectares, a net gain of about 160 hectares (+3.2%). New forest grew on about 537 hectares, while 378 hectares were lost.
What is the tree count in Si Racha?
Si Racha has an estimated 90,544 trees across the 9.29 km² of land measured — 39.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Si Racha need?
Si Racha has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Si Racha's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Si Racha, 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 Racha; the tree count is an estimate derived from that cover.
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