City report · North Sumatra, Indonesia
Pematangsiantar Air quality today
Air quality in Pematangsiantar currently reads AQI 35 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 35
Good
- PM2.5, fine particles (µg/m³)
- 4.9
- tree cover
- 23.9%
- trees in this area
- 75.0K
- more trees needed
- 19.1K
Measured across a 2 km radius around Pematangsiantar, Pematang Siantar City, North Sumatra, Indonesia (12.57 km²), from a satellite image of Sep 9, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Pematangsiantar · AQI 35 (Good)
Pematangsiantar's tree count comes to 75,009 trees across 12.56 km² of land, 6 points below the 30% tree-cover level considered healthy for this area, so roughly 19,145 more trees would close the gap.
Air quality detail
Air quality in Pematangsiantar today: AQI 35, Good
Main pollutant: PM2.5 · Observed Nov 11, 12:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 85 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 3 station cities within 85 km, e.g. Kecamatan Perbaungan and Kecamatan Beringin
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.9
PM10
8.6
NO₂
1.1
O₃
82.0
SO₂
1.8
CO
219.0
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put Pematangsiantar's daily AQI at 82 on average, from 72 on Nov 7 to an hourly peak of 157 on Nov 5.
This is the US EPA AQI. How it differs from Indonesia's ISPU
Where Pematangsiantar stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Pematangsiantar: Below target
23.9% tree cover against a 30% healthy-neighborhood target, across 12.56 km² of land.
Trees in this area
75,009
Target trees
94,154
More trees needed
19,145
CO₂ if planted / yr
421.2 t
Deforestation · 2001–2025
How much forest has Pematangsiantar lost?
Since 2001, the area within 10 km of Pematangsiantar has lost about 8,860 hectares of forest (about 12,000 football pitches): 49% of the forest it had in 2000. Most of it (92%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from April 2017 of a 5 × 5 km area about 7 km south of the city center.
- Forest lost since 2001
- 8,860 haabout 12,000 football pitches
- Share of its forest
- 49%of what there was in 2000
- Cleared for good
- 8,180 hadeforestation: turned into farms, mines or towns
Forest loss is speeding up: about 593 hectares a year in 2021–2025, up from 333 hectares a year in 2016–2020. The worst year was 2023, when about 1,030 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 | 338 ha | 8 ha | 346 ha |
| 2002 | 54 ha | under 1 ha | 54 ha |
| 2003 | 139 ha | under 1 ha | 139 ha |
| 2004 | 497 ha | 27 ha | 524 ha |
| 2005 | 291 ha | 65 ha | 356 ha |
| 2006 | 164 ha | 3 ha | 167 ha |
| 2007 | 767 ha | 192 ha | 959 ha |
| 2008 | 124 ha | under 1 ha | 124 ha |
| 2009 | 474 ha | 1 ha | 475 ha |
| 2010 | 290 ha | 2 ha | 292 ha |
| 2011 | 397 ha | 4 ha | 401 ha |
| 2012 | 158 ha | 2 ha | 160 ha |
| 2013 | 38 ha | under 1 ha | 38 ha |
| 2014 | 116 ha | under 1 ha | 116 ha |
| 2015 | 82 ha | under 1 ha | 82 ha |
| 2016 | 637 ha | 36 ha | 673 ha |
| 2017 | 378 ha | 1 ha | 379 ha |
| 2018 | 165 ha | under 1 ha | 165 ha |
| 2019 | 324 ha | under 1 ha | 324 ha |
| 2020 | 123 ha | under 1 ha | 123 ha |
| 2021 | 757 ha | 23 ha | 780 ha |
| 2022 | 600 ha | 33 ha | 633 ha |
| 2023 | 745 ha | 283 ha | 1,030 ha |
| 2024 | 267 ha | under 1 ha | 267 ha |
| 2025 | 257 ha | 1 ha | 258 ha |
What is causing deforestation around Pematangsiantar?
- Farms, pasture and plantationscleared for good90% · 7,990 ha
- Loggingcan grow back7.7% · 681 ha
- Towns and roadscleared for good2.2% · 193 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
- 20,500 ha
- Forest in 2020
- 20,800 ha
- Overall change
- +291 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Pematangsiantar stayed about the same size, at about 20,800 hectares: new forest grew on about 1,610 hectares, and about 1,310 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 Pematangsiantar
Same 2 km radius, same index — so they compare directly.
- Tebingtinggi42.3 km
Indonesia
- Tree cover
- 35%
- Air quality
- 52
- Kisaran60.8 km
Indonesia
- Tree cover
- 61%
- Air quality
- 56
- Perbaungan68.8 km
Indonesia
- Tree cover
- 54%
- Air quality
- 128
- Percut77.4 km
Indonesia
- Tree cover
- 30%
- Air quality
- 128
- Tanjungbalai81.2 km
Indonesia
- Tree cover
- 36%
- Air quality
- 54
- Medan82.5 km
Indonesia
- Tree cover
- 16%
- Air quality
- 128
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Frequently asked
Questions about Pematangsiantar
What is the air quality (AQI) in Pematangsiantar right now?
The latest reading for Pematangsiantar shows an AQI of 35 (Good), observed Nov 11, 12:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 85 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Pematangsiantar today?
At AQI 35 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Pematangsiantar been like this week?
Over the last 7 days, the CAMS air-quality model put Pematangsiantar's daily AQI at 82 on average, from 72 on Nov 7 to an hourly peak of 157 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Pematangsiantar'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 Pematangsiantar lost since 2001?
Since 2001, the area within 10 km of Pematangsiantar has lost about 8,860 hectares of forest (about 12,000 football pitches): 49% of the forest it had in 2000. Most of it (92%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Forest loss is speeding up: about 593 hectares a year in 2021–2025, up from 333 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Pematangsiantar stayed about the same size, at about 20,800 hectares: new forest grew on about 1,610 hectares, and about 1,310 hectares were lost.
What is the tree count in Pematangsiantar?
Pematangsiantar has an estimated 75,009 trees across the 12.56 km² of land measured — 23.9% tree cover, 6 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Pematangsiantar need?
Pematangsiantar needs roughly 19,145 more trees to close a 6-point shortfall against its 30% tree-cover target — about 421.2 t of extra CO₂ absorbed per year once grown.
How are Pematangsiantar'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 Pematangsiantar; the tree count is an estimate derived from that cover.
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