City report · Central Java, Indonesia
Semarang Air quality today
Air quality in Semarang currently reads AQI 88 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 88
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 29.2
- tree cover
- 16.6%
- trees in this area
- 52.1K
- more trees needed
- 42.1K
Measured across a 2 km radius around Semarang, Semarang City, Central Java, Indonesia (12.57 km²), from a satellite image of Sep 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Semarang · AQI 88 (Moderate)
Semarang's tree count comes to 52,150 trees across 12.57 km², 13 points below the 30% tree-cover level considered healthy for this area, so roughly 42,097 more trees would close the gap.
Air quality detail
Air quality in Semarang today: AQI 88, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 23:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · Semarang, Indonesia, 4.5 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
29.2
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, BMKG | Badan Meteorologi, Klimatologi dan Geofisika
- 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 Semarang's daily AQI at 118 on average, from 110 on Nov 10 to an hourly peak of 163 on Nov 6.
This is the US EPA AQI. How it differs from Indonesia's ISPU
Where Semarang stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Semarang: Critically low
16.6% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
52,150
Target trees
94,247
More trees needed
42,097
CO₂ if planted / yr
926.1 t
Deforestation · 2001–2025
How much forest has Semarang lost?
Since 2001, the area within 10 km of Semarang has lost about 272 hectares of forest (about 380 football pitches): 5.6% of the forest it had in 2000. Most of it (97%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km southwest of the city center.
- Forest lost since 2001
- 272 haabout 380 football pitches
- Share of its forest
- 5.6%of what there was in 2000
- Cleared for good
- 262 hadeforestation: turned into farms, mines or towns
The worst year was 2004, when about 31 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 | 28 ha | under 1 ha | 29 ha |
| 2002 | 20 ha | under 1 ha | 20 ha |
| 2003 | 4 ha | under 1 ha | 5 ha |
| 2004 | 30 ha | under 1 ha | 31 ha |
| 2005 | 8 ha | under 1 ha | 9 ha |
| 2006 | 23 ha | under 1 ha | 23 ha |
| 2007 | 6 ha | under 1 ha | 7 ha |
| 2008 | 12 ha | 2 ha | 14 ha |
| 2009 | 23 ha | under 1 ha | 23 ha |
| 2010 | 7 ha | under 1 ha | 8 ha |
| 2011 | 19 ha | 1 ha | 20 ha |
| 2012 | 9 ha | under 1 ha | 10 ha |
| 2013 | 1 ha | under 1 ha | 1 ha |
| 2014 | 4 ha | under 1 ha | 4 ha |
| 2015 | 9 ha | under 1 ha | 9 ha |
| 2016 | 4 ha | under 1 ha | 4 ha |
| 2017 | 10 ha | under 1 ha | 10 ha |
| 2018 | 9 ha | under 1 ha | 9 ha |
| 2019 | 11 ha | under 1 ha | 11 ha |
| 2020 | 2 ha | under 1 ha | 3 ha |
| 2021 | 6 ha | under 1 ha | 6 ha |
| 2022 | 3 ha | under 1 ha | 3 ha |
| 2023 | 7 ha | under 1 ha | 7 ha |
| 2024 | 5 ha | under 1 ha | 5 ha |
| 2025 | 3 ha | under 1 ha | 4 ha |
What is causing deforestation around Semarang?
- Towns and roadscleared for good71% · 192 ha
- Farms, pasture and plantationscleared for good26% · 70 ha
- Unknown causescause unknown3.5% · 9 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
- 9,340 ha
- Forest in 2020
- 9,330 ha
- Overall change
- −8 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Semarang stayed about the same size, at about 9,330 hectares: new forest grew on about 471 hectares, and about 479 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 Semarang
What is the air quality (AQI) in Semarang right now?
The latest reading for Semarang shows an AQI of 88 (Moderate), measured Nov 11, 23:00 local time by the Semarang, Indonesia ground monitoring station, 4.5 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 Semarang today?
At AQI 88 (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 Semarang been like this week?
Over the last 7 days, the CAMS air-quality model put Semarang's daily AQI at 118 on average, from 110 on Nov 10 to an hourly peak of 163 on Nov 6. On 7 of those days the average was above 100, unhealthy for sensitive groups.
Is Semarang'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 Semarang lost since 2001?
Since 2001, the area within 10 km of Semarang has lost about 272 hectares of forest (about 380 football pitches): 5.6% of the forest it had in 2000. Most of it (97%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Semarang stayed about the same size, at about 9,330 hectares: new forest grew on about 471 hectares, and about 479 hectares were lost.
What is the tree count in Semarang?
Semarang has an estimated 52,150 trees across the 12.57 km² measured — 16.6% tree cover, 13 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Semarang need?
Semarang needs roughly 42,097 more trees to close a 13-point shortfall against its 30% tree-cover target — about 926.1 t of extra CO₂ absorbed per year once grown.
How are Semarang's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Semarang, 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 Semarang; the tree count is an estimate derived from that cover.
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