Malaysia · Johor · 8 cities
Air quality in Johor today The AQI right now, city by city
Right now, Muar has the cleanest air of the 8 cities we track in Johor (AQI 27, Good), and Iskandar Puteri the worst (AQI 82, Moderate). Iskandar Puteri has the most tree cover, at 53.2% — #12 of 56 cities measured in Malaysia.
Every city is measured the same way, over the same 2 km around its center: the air quality right now, from ground stations where there are any, and its tree cover.
Average right now
AQI 63
Moderate
- cities tracked
- 8
- average tree cover
- 32.7%
- Malaysia: 38.7%
- worst air now: Iskandar Puteri
- 82
- cleanest air now: Muar
- 27
Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous, and it reads differently from Malaysia's API (IPU). Measured by Airleaf, refreshed hourly.
Johor · average AQI 63
Air quality today across Johor, city by city
| Johor Bahru | 72Moderate | 22.3% | 20.1K | #47 of 56 |
|---|---|---|---|---|
| Pelentong | 75Moderate | 44.7% | — | #17 of 56 |
| Iskandar Puteri | 82Moderate | 53.2% | — | #12 of 56 |
| Pasir Gudang | 75Moderate | 23.6% | 20.1K | #43 of 56 |
| Mukim Pulai | 70Moderate | 40.2% | — | #24 of 56 |
| Kluang | 53Moderate | 29.9% | 314 | #32 of 56 |
| Muar | 27Good | 27.0% | 8.4K | #38 of 56 |
| Batu Pahat | 52Moderate | 20.7% | 28.6K | #51 of 56 |
Air quality is the US AQI from ground monitoring stations via OpenAQ where available, otherwise the Open-Meteo / CAMS model, refreshed hourly. Tree cover is measured within 2 km of each city center from Sentinel-2 imagery; the rank compares every city measured in Malaysia.
Is this 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.
Malaysia's API (IPU) and the AQI, explainedDeforestation · 2001–2025
How much forest has Johor lost?
Since 2001, Johor has lost about 826,000 hectares of forest (about 8,300 km²): 52% of the forest it had in 2000. Most of it (98%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
- Forest lost since 2001
- 826,000 haabout 8,300 km²
- Share of its forest
- 52%of what there was in 2000
- Cleared for good
- 808,000 hadeforestation: turned into farms, mines or towns
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 42,400 ha | 1,320 ha | 43,800 ha |
| 2002 | 34,500 ha | 967 ha | 35,500 ha |
| 2003 | 13,100 ha | 279 ha | 13,400 ha |
| 2004 | 39,300 ha | 1,000 ha | 40,300 ha |
| 2005 | 42,800 ha | 1,060 ha | 43,900 ha |
| 2006 | 34,700 ha | 1,810 ha | 36,500 ha |
| 2007 | 38,700 ha | 704 ha | 39,400 ha |
| 2008 | 18,300 ha | 157 ha | 18,500 ha |
| 2009 | 46,000 ha | 491 ha | 46,500 ha |
| 2010 | 27,600 ha | 506 ha | 28,100 ha |
| 2011 | 58,200 ha | 404 ha | 58,600 ha |
| 2012 | 38,700 ha | 213 ha | 38,900 ha |
| 2013 | 24,700 ha | 307 ha | 25,000 ha |
| 2014 | 49,200 ha | 1,320 ha | 50,500 ha |
| 2015 | 30,600 ha | 1,080 ha | 31,700 ha |
| 2016 | 43,900 ha | 1,110 ha | 45,000 ha |
| 2017 | 43,100 ha | 995 ha | 44,100 ha |
| 2018 | 32,200 ha | 751 ha | 33,000 ha |
| 2019 | 29,900 ha | 614 ha | 30,500 ha |
| 2020 | 22,200 ha | 411 ha | 22,600 ha |
| 2021 | 21,200 ha | 101 ha | 21,300 ha |
| 2022 | 15,600 ha | 192 ha | 15,700 ha |
| 2023 | 23,800 ha | 896 ha | 24,700 ha |
| 2024 | 18,500 ha | 746 ha | 19,200 ha |
| 2025 | 18,500 ha | 1,100 ha | 19,600 ha |
Forest loss is slowing down: about 20,100 hectares a year in 2021–2025, down from 35,000 hectares a year in 2016–2020. The worst year was 2011, when about 58,600 hectares of forest were lost.
What is causing deforestation in Johor?
- Farms, pasture and plantationscleared for good94% · 774,000 ha
- Towns and roadscleared for good2.9% · 24,200 ha
- Loggingcan grow back1.8% · 15,200 ha
Also: mining and energy, wildfires, storms, floods and other natural causes, shifting farming, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
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. How it's measured
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