Air quality comparison · Malaysia, 13 km apart
Kapar vs Klang Air quality index (AQI) today
Kapar has cleaner air than Klang right now: AQI 68 (Moderate) against 86 (Moderate).
Both sit in the same EPA band, so the health advice is the same for each today. Over the past 6 days, on modeled daily averages, Kapar averaged AQI 54 against 88, and it was the cleaner of the two on 6 of those days. Kapar has lost more forest since 2001. Kapar has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Kapar68Klang86
Head to head
Kapar vs Klang at a glance
Kapar is ahead on 5 of 6 measures, and Klang on 1. The better figure in each row is marked.
| Kapar | Klang | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 68 (better) | 86 |
| PM2.5Fine particles, µg/m³. | 18.3 (better) | 27.8 |
| Past week's averageUS AQI, 6 days. | 54 (better) | 88 |
| Forest lost since 2001Within 10 km of the center. | 9,700 ha | 5,140 ha (better) |
| Tree coverWithin 2 km of the center. | 54.5% (better) | 23.3% |
| Trees still neededTo reach a healthy canopy. | 0 (better) | 20.6K |
Air quality today
What is the air like in Kapar and Klang right now?
Kapar has cleaner air than Klang right now: AQI 68 (Moderate) against 86 (Moderate). PM2.5 is setting the index in both.
Kapar's PM2.5 is about 1.2× the WHO's 24-hour guideline of 15 µg/m³. Klang's PM2.5 is about 1.9× the WHO's 24-hour guideline of 15 µg/m³.
Both readings come from ground stations, and the closest one is the same for both (Pelabuhan Kelang, Selangor, Malaysia), so read a small gap with care.
KaparKlang
Concentrations at the same moment as the index above, for the pollutants both places report. Lower is better. The dark marks on the PM2.5 and PM10 rows show the WHO's 24-hour guidelines (15 and 45 µg/m³).
Kapar: Ground station · Pelabuhan Kelang, Selangor, Malaysia, 13.6 km away · median of 3 stations. Data: World Air Quality Index Project, Malaysia Department of Environment (DOE); Air Polluant Index Management System.
Klang: Ground station · Pelabuhan Kelang, Selangor, Malaysia, 4.1 km away. Data: World Air Quality Index Project, Malaysia Department of Environment (DOE); Air Polluant Index Management System.
The past week
Which had cleaner air over the past 6 days?
Over the past 6 days, on modeled daily averages, Kapar averaged AQI 54 against 88, and it was the cleaner of the two on 6 of those days. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Kapar6Klang0
- Average AQI
- Kapar54Klang88
- Worst day, AQI
- Kapar59Klang92
The daily numbers (6 days)
| Day | Kapar | Klang |
|---|---|---|
| Nov 5 | 50 | 92 |
| Nov 6 | 47 | 90 |
| Nov 7 | 57 | 83 |
| Nov 8 | 59 | 87 |
| Nov 9 | 57 | 83 |
| Nov 10 | 56 | 91 |
Daily averages from the CAMS atmospheric model for both places, so the week compares like with like. They can differ from today's reading at the top of the page wherever that comes from a ground station.
What it means today
Is it safe to go outside in Kapar and Klang today?
Unusually sensitive people should consider limiting long outdoor exertion. Both are in the same EPA band today (Moderate), so the advice is the same.
Exercise outdoors
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.
Air purifier
Worth running if you are sensitive.
Against everywhere else
How do Kapar and Klang compare with the rest of the world?
Right now Kapar's air is cleaner than 40% of the 5,420 places Airleaf tracks, and Klang's is cleaner than 28%. Within Malaysia, that is 25% and 5% of its 56 measured places.
Cleaner air than…
- Kapar
- Beats 40%
- Klang
- Beats 28%
More tree cover than…
- Kapar
- Beats 94%
- Klang
- Beats 54%
Includes model estimates as well as station readings, so it can differ from our most polluted and cleanest air rankings, which use station readings only.
Deforestation · 2001–2025
Which has lost more forest, Kapar or Klang?
Kapar has lost more: about 9,700 ha of forest within 10 km of its center from 2001 to 2025, against 5,140 ha around Klang. 9,690 ha of that was cleared for good, for farms, mines or towns.
Measured within 10 km of each center, from the yearly satellite maps of forest loss: a wider circle than the one for tree cover, because forest is usually lost at a city's edges.
Worst year: 2009, with 1,140 ha lost.
Worst year: 2004, with 550 ha lost.
| Kapar | Klang | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 9,700 ha | 5,140 ha (better) |
| Share of its forestOf what it had in 2000. | 53% | 47% (better) |
| Cleared for goodTurned into farms, mines or towns. | 9,690 ha | 5,130 ha (better) |
| Recent trend2021–2025 against the five years before. | Slowing down | Slowing down |
| Main known cause | Farms, pasture and plantations (57%) | Towns and roads (84%) |
Satellite timelapses
Watch both change, year by year
A clear satellite photo a year of the land around each city. Press play, turn on the forest cleared since the first year, or drag the before and after.
Kapar
2017: satellite photo from February 2017 of a 5 × 5 km area about 4 km southeast of the city center.
Klang
2017: satellite photo from February 2017 of a 5 × 5 km area about 7 km north of the city center.
Trees
Which has more trees, Kapar or Klang?
Kapar has more tree cover: 54.5% of the land within 2 km of its center against 23.3% around Klang, or about 171,217 trees against 71,662.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Kapar | Klang | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 171K (better) | 71.7K |
| Trees still neededTo reach the target. Fewer is better. | 0 (better) | 20.6K |
| CO₂ absorbed each yearBy the trees already standing. | 3.8M kg (better) | 1.6M kg |
Tree cover on the satellite image
The same 2 km radius around each center, with the tree cover the satellite found marked on it.
Reading these numbers
How this comparison is made
Air quality index
The US EPA index, computed from current pollutant concentrations: ground stations where a place has them nearby, and the CAMS atmospheric model everywhere else. It moves hour to hour, so it is a snapshot rather than a verdict on either place. The guideline marks are from the WHO's 2021 air quality guidelines.
Trees and forest
Tree cover is the share of ground under canopy within 2 km of each center, read from Sentinel-2 satellite imagery at 10 m detail. It measures that circle, not the whole municipality, which is what makes the two comparable. Forest loss comes from the University of Maryland's Global Forest Change maps.
More on the method on the About Airleaf page.
Frequently asked
Kapar vs Klang: your questions answered
Is Kapar cleaner than Klang?
On air quality, yes, right now: Kapar reads AQI 68 against 86, a gap of 18 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. Over the past 6 days, on modeled daily averages, Kapar averaged AQI 54 against 88, and it was the cleaner of the two on 6 of those days.
Is it safe to exercise outdoors in Kapar and Klang today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Kapar reads AQI 68 and Klang reads AQI 86.
Which has lost more forest, Kapar or Klang?
Kapar has lost more: about 9,700 ha of forest within 10 km of its center from 2001 to 2025, against 5,140 ha around Klang. 9,690 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Kapar or Klang?
Kapar has more tree cover: 54.5% of the land within 2 km of its center against 23.3% around Klang, or about 171,217 trees against 71,662. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Kapar and Klang need?
Kapar needs about 0 more to reach its canopy target of 30%, and Klang about 20,607 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Why can two places 13 km apart read differently?
Air changes over short distances with traffic, industry, wind and hills, and each reading comes from the nearest ground stations or, where there are none, from a regional model. A gap of a few points between neighbors is within normal variation, while a gap that crosses an EPA band is worth noticing.
Are Kapar and Klang measured the same way?
The method is the same: the US EPA index for air, and Sentinel-2 satellite imagery at 10 m detail over an identical radius for trees. Both readings come from ground stations, and the closest one is the same for both (Pelabuhan Kelang, Selangor, Malaysia), so read a small gap with care. Nothing is adjusted for population, city limits or climate.
How often does the Kapar vs Klang comparison update?
The air readings refresh about once an hour, and each reading's local time is shown at the top of the page. Tree cover comes from the latest clear satellite image of each area (Aug 15, 2026 and Aug 15, 2026), and the forest figures are published yearly.
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