City report · East Java, Indonesia
Sidoarjo Air quality today
Air quality in Sidoarjo currently reads AQI 162 (Unhealthy): Everyone should limit long outdoor exertion; sensitive groups more so.
AQI 162
Air quality right now
Unhealthy
- PM2.5, fine particles (µg/m³)
- 69.8
- tree cover
- 16.3%
- trees in this area
- 51.2K
- more trees needed
- 74.5K
Measured across a 2 km radius around Sidoarjo, Sidoarjo Regency, East Java, Indonesia (12.57 km²), from a satellite image of Sep 26, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Sidoarjo · AQI 162 (Unhealthy)
Sidoarjo's tree count comes to 51,208 trees across 12.57 km², 24 points below the 40% tree-cover level considered healthy for this area, so roughly 74,456 more trees would close the gap.
Air quality detail
Air quality in Sidoarjo today: AQI 162, Unhealthy
Main pollutant: PM2.5 · Observed Nov 11, 06:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Everyone should limit long outdoor exertion; sensitive groups more so.
PM2.5
69.8
PM10
70.5
NO₂
29.4
O₃
54.0
SO₂
20.9
CO
1039.0
- Outdoor exercise
- Everyone should cut down long or hard exercise; sensitive groups should avoid it
- Windows
- Keep them closed
- Mask
- Wear an N95 outdoors
- Air purifier
- Run one
Over the last 7 days, the CAMS air-quality model put Sidoarjo's daily AQI at 132 on average, from 123 on Nov 8 to an hourly peak of 209 on Nov 7.
This is the US EPA AQI. How it differs from Indonesia's ISPU
Where Sidoarjo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Sidoarjo: Critically low
16.3% tree cover against a 40% healthy-neighborhood target, across 12.57 km².
Trees in this area
51,208
Target trees
125,664
More trees needed
74,456
CO₂ if planted / yr
1,638 t
Deforestation · 2001–2025
How much forest has Sidoarjo lost?
Since 2001, the area within 10 km of Sidoarjo has lost about 53 hectares of forest (about 75 football pitches): 1.4% of the forest it had in 2000. Most of it (53%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from September 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 53 haabout 75 football pitches
- Share of its forest
- 1.4%of what there was in 2000
- Cleared for good
- 28 hadeforestation: turned into farms, mines or towns
The worst year was 2001, when about 16 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 | 10 ha | 6 ha | 16 ha |
| 2002 | under 1 ha | under 1 ha | 2 ha |
| 2003 | 2 ha | under 1 ha | 3 ha |
| 2004 | 4 ha | 3 ha | 7 ha |
| 2005 | 1 ha | 3 ha | 4 ha |
| 2006 | under 1 ha | 2 ha | 3 ha |
| 2007 | under 1 ha | 2 ha | 3 ha |
| 2008 | under 1 ha | 2 ha | 2 ha |
| 2009 | under 1 ha | 2 ha | 2 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | 1 ha | 2 ha |
| 2012 | 2 ha | under 1 ha | 2 ha |
| 2013 | under 1 ha | under 1 ha | 1 ha |
| 2014 | 1 ha | under 1 ha | 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 | 2 ha | under 1 ha | 3 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around Sidoarjo?
- Towns and roadscleared for good44% · 23 ha
- Farms, pasture and plantationscleared for good6.6% · 4 ha
- Mining and energycleared for good3% · 2 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
- 2,540 ha
- Forest in 2020
- 2,590 ha
- Overall change
- +49 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Sidoarjo stayed about the same size, at about 2,590 hectares: new forest grew on about 250 hectares, and about 201 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
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Frequently asked
Questions about Sidoarjo
What is the air quality (AQI) in Sidoarjo right now?
The latest reading for Sidoarjo shows an AQI of 162 (Unhealthy), observed Nov 11, 06:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Everyone should limit long outdoor exertion; sensitive groups more so.
Is it safe to exercise outside in Sidoarjo today?
At AQI 162 (Unhealthy): everyone should cut down long or hard exercise; sensitive groups should avoid it. Windows: keep them closed. Masks: wear an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Sidoarjo been like this week?
Over the last 7 days, the CAMS air-quality model put Sidoarjo's daily AQI at 132 on average, from 123 on Nov 8 to an hourly peak of 209 on Nov 7. On 7 of those days the average was above 100, unhealthy for sensitive groups.
Is Sidoarjo'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 Sidoarjo lost since 2001?
Since 2001, the area within 10 km of Sidoarjo has lost about 53 hectares of forest (about 75 football pitches): 1.4% of the forest it had in 2000. Most of it (53%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Sidoarjo stayed about the same size, at about 2,590 hectares: new forest grew on about 250 hectares, and about 201 hectares were lost.
What is the tree count in Sidoarjo?
Sidoarjo has an estimated 51,208 trees across the 12.57 km² measured — 16.3% tree cover, 24 percentage points short of the 40% tree-cover target set for this area.
How many more trees does Sidoarjo need?
Sidoarjo needs roughly 74,456 more trees to close a 24-point shortfall against its 40% tree-cover target — about 1,638 t of extra CO₂ absorbed per year once grown.
How are Sidoarjo'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 Sidoarjo; the tree count is an estimate derived from that cover.
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