City report · Selangor, Malaysia
Kajang Air quality today
Air quality in Kajang currently reads AQI 82 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 82
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 25.5
- tree cover
- 27.1%
- trees in this area
- 85.0K
- more trees needed
- 9.1K
Measured across a 2 km radius around Bandar Kajang, 43000 Kajang, Selangor, Malaysia (12.57 km²), from a satellite image of Aug 15, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Kajang · AQI 82 (Moderate)
Kajang's tree count comes to 84,967 trees across 12.54 km² of land, 3 points below the 30% tree-cover level considered healthy for this area, so roughly 9,092 more trees would close the gap.
Air quality detail
Air quality in Kajang today: AQI 82, Moderate
Main pollutant: PM2.5 · Observed Nov 12, 01:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · ENVIRO EXCELTECH SDN BHD, 8.8 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
25.5
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, ENVIRO EXCELTECH SDN BHD
- 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 Kajang's daily AQI at 87 on average, from 78 on Nov 10 to an hourly peak of 157 on Nov 6.
This is the US EPA AQI. How it differs from Malaysia's API (IPU) · The full guide
Where Kajang stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Kajang: Below target
27.1% tree cover against a 30% healthy-neighborhood target, across 12.54 km² of land.
Trees in this area
84,967
Target trees
94,059
More trees needed
9,092
CO₂ if planted / yr
200.0 t
Deforestation · 2001–2025
How much forest has Kajang lost?
Since 2001, the area within 10 km of Kajang has lost about 6,100 hectares of forest (about 8,500 football pitches): 48% of the forest it had in 2000. Most of it (98%) was deforestation, forest cleared for good, mainly for towns and roads.
2018: satellite photo from March 2018 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 6,100 haabout 8,500 football pitches
- Share of its forest
- 48%of what there was in 2000
- Cleared for good
- 5,980 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 143 hectares a year in 2021–2025, down from 276 hectares a year in 2016–2020. The worst year was 2014, when about 757 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 | 125 ha | under 1 ha | 125 ha |
| 2002 | 254 ha | under 1 ha | 254 ha |
| 2003 | 196 ha | under 1 ha | 196 ha |
| 2004 | 295 ha | 1 ha | 296 ha |
| 2005 | 175 ha | under 1 ha | 175 ha |
| 2006 | 159 ha | under 1 ha | 159 ha |
| 2007 | 277 ha | under 1 ha | 277 ha |
| 2008 | 149 ha | 1 ha | 150 ha |
| 2009 | 401 ha | 64 ha | 465 ha |
| 2010 | 464 ha | 25 ha | 489 ha |
| 2011 | 115 ha | under 1 ha | 115 ha |
| 2012 | 184 ha | 3 ha | 187 ha |
| 2013 | 57 ha | 1 ha | 59 ha |
| 2014 | 736 ha | 21 ha | 757 ha |
| 2015 | 297 ha | under 1 ha | 297 ha |
| 2016 | 553 ha | 3 ha | 556 ha |
| 2017 | 287 ha | under 1 ha | 287 ha |
| 2018 | 154 ha | under 1 ha | 154 ha |
| 2019 | 233 ha | under 1 ha | 233 ha |
| 2020 | 151 ha | under 1 ha | 151 ha |
| 2021 | 230 ha | 2 ha | 232 ha |
| 2022 | 141 ha | 1 ha | 142 ha |
| 2023 | 155 ha | under 1 ha | 155 ha |
| 2024 | 94 ha | under 1 ha | 94 ha |
| 2025 | 94 ha | under 1 ha | 94 ha |
What is causing deforestation around Kajang?
- Towns and roadscleared for good73% · 4,440 ha
- Mining and energycleared for good16% · 1,000 ha
- Farms, pasture and plantationscleared for good8.7% · 529 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
- 16,600 ha
- Forest in 2020
- 14,200 ha
- Overall change
- −2,400 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Kajang shrank from about 16,600 hectares to 14,200 hectares, a net loss of about 2,400 hectares (−14%). New forest grew on about 2,270 hectares, but 4,660 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 Kajang
Same 2 km radius, same index — so they compare directly.
- Bukit Jalil13.5 km
Malaysia
- Tree cover
- 29%
- Air quality
- 83
- Puchong19.1 km
Malaysia
- Tree cover
- 14%
- Air quality
- 72
- Kuala Lumpur19.9 km
Malaysia
- Tree cover
- 44%
- Air quality
- 68
- Petaling Jaya23.8 km
Malaysia
- Tree cover
- 16%
- Air quality
- 66
- Setapak24.6 km
Malaysia
- Tree cover
- 16%
- Air quality
- 88
- Selayang Baru Utara32.0 km
Malaysia
- Tree cover
- 29%
- Air quality
- 113
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Frequently asked
Questions about Kajang
What is the air quality (AQI) in Kajang right now?
The latest reading for Kajang shows an AQI of 82 (Moderate), measured Nov 12, 01:00 local time by the ENVIRO EXCELTECH SDN BHD ground monitoring station, 8.8 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 Kajang today?
At AQI 82 (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 Kajang been like this week?
Over the last 7 days, the CAMS air-quality model put Kajang's daily AQI at 87 on average, from 78 on Nov 10 to an hourly peak of 157 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Kajang's AQI the same as Malaysia's API (IPU)?
No. Airleaf shows the US EPA Air Quality Index (AQI), the scale used by IQAir and most air-quality apps. Malaysia's Department of Environment (Jabatan Alam Sekitar) publishes its own Air Pollutant Index, the API or Indeks Pencemar Udara (IPU), every hour for each of its monitoring stations on APIMS (apims.doe.gov.my). Both scales call 0–50 good and 51–100 moderate; above that the IPU runs 101–200 unhealthy, 201–300 very unhealthy and over 300 hazardous. The two use different breakpoints and averaging times, so the numbers for the same hour often differ. For the official IPU reading, check the nearest station on APIMS.
How much forest has the area around Kajang lost since 2001?
Since 2001, the area within 10 km of Kajang has lost about 6,100 hectares of forest (about 8,500 football pitches): 48% of the forest it had in 2000. Most of it (98%) was deforestation, forest cleared for good, mainly for towns and roads. Forest loss is slowing down: about 143 hectares a year in 2021–2025, down from 276 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Kajang shrank from about 16,600 hectares to 14,200 hectares, a net loss of about 2,400 hectares (−14%). New forest grew on about 2,270 hectares, but 4,660 hectares were lost.
What is the tree count in Kajang?
Kajang has an estimated 84,967 trees across the 12.54 km² of land measured — 27.1% tree cover, 3 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Kajang need?
Kajang needs roughly 9,092 more trees to close a 3-point shortfall against its 30% tree-cover target — about 200.0 t of extra CO₂ absorbed per year once grown.
How are Kajang's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Bandar Kajang, 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 Bandar Kajang; the tree count is an estimate derived from that cover.
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