City report · Selangor, Malaysia
Klang Air quality today
Air quality in Klang currently reads AQI 86 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 86
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 27.8
- tree cover
- 23.3%
- trees in this area
- 71.7K
- more trees needed
- 20.6K
Measured across a 2 km radius around Klang, 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.
Klang · AQI 86 (Moderate)
Klang's tree count comes to 71,662 trees across 12.31 km² of land, 7 points below the 30% tree-cover level considered healthy for this area, so roughly 20,607 more trees would close the gap.
Air quality detail
Air quality in Klang today: AQI 86, 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 · Pelabuhan Kelang, Selangor, Malaysia, 4.1 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
27.8
PM10
35.6
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project, Malaysia Department of Environment (DOE); Air Polluant Index Management System
- 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 Klang's daily AQI at 89 on average, from 83 on Nov 7 to an hourly peak of 165 on Nov 4.
This is the US EPA AQI. How it differs from Malaysia's API (IPU) · The full guide
Where Klang stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Klang: Below target
23.3% tree cover against a 30% healthy-neighborhood target, across 12.31 km² of land.
Trees in this area
71,662
Target trees
92,269
More trees needed
20,607
CO₂ if planted / yr
453.4 t
Deforestation · 2001–2025
How much forest has Klang lost?
Since 2001, the area within 10 km of Klang has lost about 5,140 hectares of forest (about 7,200 football pitches): 47% of the forest it had in 2000. Most of it (over 99%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from February 2017 of a 5 × 5 km area about 7 km north of the city center.
- Forest lost since 2001
- 5,140 haabout 7,200 football pitches
- Share of its forest
- 47%of what there was in 2000
- Cleared for good
- 5,130 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 129 hectares a year in 2021–2025, down from 194 hectares a year in 2016–2020. The worst year was 2004, when about 550 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 | 166 ha | under 1 ha | 166 ha |
| 2002 | 262 ha | under 1 ha | 262 ha |
| 2003 | 198 ha | under 1 ha | 198 ha |
| 2004 | 550 ha | under 1 ha | 550 ha |
| 2005 | 286 ha | under 1 ha | 286 ha |
| 2006 | 119 ha | under 1 ha | 119 ha |
| 2007 | 311 ha | 1 ha | 312 ha |
| 2008 | 148 ha | under 1 ha | 148 ha |
| 2009 | 435 ha | under 1 ha | 435 ha |
| 2010 | 370 ha | under 1 ha | 370 ha |
| 2011 | 106 ha | under 1 ha | 106 ha |
| 2012 | 271 ha | under 1 ha | 271 ha |
| 2013 | 9 ha | under 1 ha | 9 ha |
| 2014 | 146 ha | under 1 ha | 146 ha |
| 2015 | 142 ha | 1 ha | 143 ha |
| 2016 | 231 ha | under 1 ha | 231 ha |
| 2017 | 230 ha | under 1 ha | 230 ha |
| 2018 | 230 ha | under 1 ha | 230 ha |
| 2019 | 173 ha | under 1 ha | 173 ha |
| 2020 | 107 ha | under 1 ha | 107 ha |
| 2021 | 160 ha | under 1 ha | 160 ha |
| 2022 | 70 ha | under 1 ha | 70 ha |
| 2023 | 179 ha | under 1 ha | 179 ha |
| 2024 | 118 ha | under 1 ha | 118 ha |
| 2025 | 113 ha | 6 ha | 119 ha |
What is causing deforestation around Klang?
- Towns and roadscleared for good84% · 4,310 ha
- Farms, pasture and plantationscleared for good12% · 592 ha
- Mining and energycleared for good4.4% · 224 ha
Also: storms, floods and other natural causes, 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
- 12,700 ha
- Forest in 2020
- 7,790 ha
- Overall change
- −4,920 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Klang shrank from about 12,700 hectares to 7,790 hectares, a net loss of about 4,920 hectares (−39%). New forest grew on about 690 hectares, but 5,610 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 Klang
Same 2 km radius, same index — so they compare directly.
- Kampung Baru Subang16.1 km
Malaysia
- Tree cover
- 25%
- Air quality
- 66
- Puchong19.7 km
Malaysia
- Tree cover
- 14%
- Air quality
- 72
- Petaling Jaya19.8 km
Malaysia
- Tree cover
- 16%
- Air quality
- 66
- Bukit Rahman Putra23.9 km
Malaysia
- Tree cover
- 38%
- Air quality
- 63
- Bukit Jalil26.4 km
Malaysia
- Tree cover
- 29%
- Air quality
- 83
Also compared:Klang vs Bandar Tasik PuteriKlang vs Ijok
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Frequently asked
Questions about Klang
What is the air quality (AQI) in Klang right now?
The latest reading for Klang shows an AQI of 86 (Moderate), measured Nov 11, 23:00 local time by the Pelabuhan Kelang, Selangor, Malaysia ground monitoring station, 4.1 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 Klang today?
At AQI 86 (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 Klang been like this week?
Over the last 7 days, the CAMS air-quality model put Klang's daily AQI at 89 on average, from 83 on Nov 7 to an hourly peak of 165 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
Is Klang'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 Klang lost since 2001?
Since 2001, the area within 10 km of Klang has lost about 5,140 hectares of forest (about 7,200 football pitches): 47% of the forest it had in 2000. Most of it (over 99%) was deforestation, forest cleared for good, mainly for towns and roads. Forest loss is slowing down: about 129 hectares a year in 2021–2025, down from 194 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Klang shrank from about 12,700 hectares to 7,790 hectares, a net loss of about 4,920 hectares (−39%). New forest grew on about 690 hectares, but 5,610 hectares were lost.
What is the tree count in Klang?
Klang has an estimated 71,662 trees across the 12.31 km² of land measured — 23.3% tree cover, 7 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Klang need?
Klang needs roughly 20,607 more trees to close a 7-point shortfall against its 30% tree-cover target — about 453.4 t of extra CO₂ absorbed per year once grown.
How are Klang's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Klang, 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 Klang; the tree count is an estimate derived from that cover.
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