City report · Banten, Indonesia
Cilegon Air quality today
Air quality in Cilegon currently reads AQI 98 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 98
Moderate
- PM2.5, fine particles (µg/m³)
- 34.6
- tree cover
- 12.0%
- trees in this area
- 37.6K
- more trees needed
- 56.4K
Measured across a 2 km radius around Cilegon, Banten, Indonesia (12.57 km²), from a satellite image of Sep 10, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Cilegon · AQI 98 (Moderate)
Cilegon's tree count comes to 37,624 trees across 12.54 km² of land, 18 points below the 30% tree-cover level considered healthy for this area, so roughly 56,436 more trees would close the gap.
Air quality detail
Air quality in Cilegon today: AQI 98, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 16:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 105 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 7 station cities within 105 km, e.g. Teluknaga and Tangerang
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
34.6
PM10
51.9
NO₂
18.1
O₃
139.0
SO₂
31.2
CO
521.0
- 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 Cilegon's daily AQI at 138 on average, from 120 on Nov 7 to an hourly peak of 195 on Nov 8.
This is the US EPA AQI. How it differs from Indonesia's ISPU
Where Cilegon stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Cilegon: Critically low
12.0% tree cover against a 30% healthy-neighborhood target, across 12.54 km² of land.
Trees in this area
37,624
Target trees
94,060
More trees needed
56,436
CO₂ if planted / yr
1,242 t
Deforestation · 2001–2025
How much forest has Cilegon lost?
Since 2001, the area within 10 km of Cilegon has lost about 135 hectares of forest (about 190 football pitches): 2% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 135 haabout 190 football pitches
- Share of its forest
- 2%of what there was in 2000
- Cleared for good
- 117 hadeforestation: turned into farms, mines or towns
The worst year was 2011, when about 32 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 | 4 ha | 2 ha | 6 ha |
| 2002 | under 1 ha | 1 ha | 2 ha |
| 2003 | 1 ha | under 1 ha | 2 ha |
| 2004 | under 1 ha | under 1 ha | 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | 3 ha | 1 ha | 5 ha |
| 2007 | 3 ha | 1 ha | 4 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | 4 ha | under 1 ha | 5 ha |
| 2010 | 1 ha | under 1 ha | 2 ha |
| 2011 | 30 ha | 2 ha | 32 ha |
| 2012 | 13 ha | 3 ha | 16 ha |
| 2013 | 2 ha | under 1 ha | 2 ha |
| 2014 | 2 ha | under 1 ha | 2 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 2 ha | under 1 ha | 2 ha |
| 2017 | 15 ha | under 1 ha | 15 ha |
| 2018 | 5 ha | under 1 ha | 5 ha |
| 2019 | 6 ha | under 1 ha | 7 ha |
| 2020 | 4 ha | under 1 ha | 4 ha |
| 2021 | 2 ha | under 1 ha | 2 ha |
| 2022 | 6 ha | under 1 ha | 6 ha |
| 2023 | 7 ha | under 1 ha | 7 ha |
| 2024 | 4 ha | under 1 ha | 4 ha |
| 2025 | 2 ha | 3 ha | 5 ha |
What is causing deforestation around Cilegon?
- Towns and roadscleared for good61% · 82 ha
- Farms, pasture and plantationscleared for good20% · 27 ha
- Mining and energycleared for good6.2% · 8 ha
Also: logging, 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
- 10,600 ha
- Forest in 2020
- 10,700 ha
- Overall change
- +40 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Cilegon stayed about the same size, at about 10,700 hectares: new forest grew on about 301 hectares, and about 261 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 Cilegon
Same 2 km radius, same index — so they compare directly.
- Serang15.8 km
Indonesia
- Tree cover
- 22%
- Air quality
- 93
- Kresek38.3 km
Indonesia
- Tree cover
- 11%
- Air quality
- 156
- Rangkasbitung44.0 km
Indonesia
- Tree cover
- 46%
- Air quality
- 95
- Pasarkemis55.4 km
Indonesia
- Tree cover
- 29%
- Air quality
- 86
- Curug62.2 km
Indonesia
- Tree cover
- 24%
- Air quality
- 96
- Teluknaga65.2 km
Indonesia
- Tree cover
- 25%
- Air quality
- 96
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Frequently asked
Questions about Cilegon
What is the air quality (AQI) in Cilegon right now?
The latest reading for Cilegon shows an AQI of 98 (Moderate), observed Nov 11, 16:00 local time via Open-Meteo / CAMS, corrected with 7 ground-station cities within 105 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 Cilegon today?
At AQI 98 (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 Cilegon been like this week?
Over the last 7 days, the CAMS air-quality model put Cilegon's daily AQI at 138 on average, from 120 on Nov 7 to an hourly peak of 195 on Nov 8. On 7 of those days the average was above 100, unhealthy for sensitive groups.
Is Cilegon's AQI the same as Indonesia's ISPU?
No. Airleaf shows the US EPA Air Quality Index (AQI), the scale used by IQAir and most air-quality apps. Indonesia's official index is the ISPU (Indeks Standar Pencemar Udara), published by the environment ministry from its own monitoring stations. Its bands are 0–50 Baik (good), 51–100 Sedang (moderate), 101–200 Tidak Sehat (unhealthy), 201–300 Sangat Tidak Sehat (very unhealthy) and over 300 Berbahaya (hazardous). The two indexes use different breakpoints and averaging times, so the same air can score differently on each.
How much forest has the area around Cilegon lost since 2001?
Since 2001, the area within 10 km of Cilegon has lost about 135 hectares of forest (about 190 football pitches): 2% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Cilegon stayed about the same size, at about 10,700 hectares: new forest grew on about 301 hectares, and about 261 hectares were lost.
What is the tree count in Cilegon?
Cilegon has an estimated 37,624 trees across the 12.54 km² of land measured — 12.0% tree cover, 18 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Cilegon need?
Cilegon needs roughly 56,436 more trees to close a 18-point shortfall against its 30% tree-cover target — about 1,242 t of extra CO₂ absorbed per year once grown.
How are Cilegon'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 Cilegon; the tree count is an estimate derived from that cover.
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