Air quality comparison · Cameroon, 58 km apart
Buea vs Kumba Air quality index (AQI) today
Buea has cleaner air than Kumba right now: AQI 31 (Good) against 63 (Moderate).
That puts them in different EPA bands, so the health advice differs today. Over the past 7 days, on modeled daily averages, Buea averaged AQI 47 against 58, and it was the cleaner of the two on 7 of those days. Buea has lost more forest since 2001. Buea has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Buea31Kumba63
Head to head
Buea vs Kumba at a glance
Buea is ahead on 5 of 6 measures, and Kumba on 1. The better figure in each row is marked.
| Buea | Kumba | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 31 (better) | 63 |
| PM2.5Fine particles, µg/m³. | 5.6 (better) | 16.4 |
| Past week's averageUS AQI, 7 days. | 47 (better) | 58 |
| Forest lost since 2001Within 10 km of the center. | 3,840 ha | 3,370 ha (better) |
| Tree coverWithin 2 km of the center. | 37.9% (better) | 26.8% |
| Trees still neededTo reach a healthy canopy. | 0 (better) | 10.1K |
Air quality today
What is the air like in Buea and Kumba right now?
Buea has cleaner air than Kumba right now: AQI 31 (Good) against 63 (Moderate). PM2.5 is setting the index in both.
Kumba's PM2.5 is about 1.1× the WHO's 24-hour guideline of 15 µg/m³.
Both readings are model estimates, with no ground station close enough to either.
BueaKumba
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).
Buea: Estimate · model corrected with 2 station cities within 250 km, e.g. Douala and Okrika. Data: Open-Meteo / CAMS, corrected with 2 ground-station cities within 250 km, US EPA index.
Kumba: Estimate · model corrected with 2 station cities within 245 km, e.g. Douala and Yaoundé. Data: Open-Meteo / CAMS, corrected with 2 ground-station cities within 245 km, US EPA index.
The past week
Which had cleaner air over the past 7 days?
Over the past 7 days, on modeled daily averages, Buea averaged AQI 47 against 58, and it was the cleaner of the two on 7 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
- Buea7Kumba0
- Average AQI
- Buea47Kumba58
- Worst day, AQI
- Buea56Kumba73
The daily numbers (7 days)
| Day | Buea | Kumba |
|---|---|---|
| Nov 4 | 51 | 54 |
| Nov 5 | 47 | 67 |
| Nov 6 | 33 | 48 |
| Nov 7 | 50 | 57 |
| Nov 8 | 56 | 73 |
| Nov 9 | 55 | 67 |
| Nov 10 | 35 | 38 |
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 Buea and Kumba today?
Buea (AQI 31, Good): Air quality is satisfactory for everyone.
Kumba (AQI 63, Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Exercise outdoors
- Buea
- A good day to be active outside.
- Kumba
- Fine for most people; unusually sensitive people should take long or hard exercise easier.
Windows
- Buea
- Open them to air the house.
- Kumba
- Fine to open; close them if you are sensitive to pollution.
Masks
- Buea
- Not needed.
- Kumba
- Not needed for most people.
Air purifier
- Buea
- Not needed.
- Kumba
- Worth running if you are sensitive.
Against everywhere else
How do Buea and Kumba compare with the rest of the world?
Right now Buea's air is cleaner than 79% of the 5,420 places Airleaf tracks, and Kumba's is cleaner than 45%. Within Cameroon, that is 93% and 73% of its 16 measured places.
Cleaner air than…
- Buea
- Beats 79%
- Kumba
- Beats 45%
More tree cover than…
- Buea
- Beats 81%
- Kumba
- Beats 62%
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, Buea or Kumba?
Buea has lost more: about 3,840 ha of forest within 10 km of its center from 2001 to 2025, against 3,370 ha around Kumba. 3,110 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: 2010, with 576 ha lost.
Worst year: 2010, with 523 ha lost.
| Buea | Kumba | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 3,840 ha | 3,370 ha (better) |
| Share of its forestOf what it had in 2000. | 16% | 12% (better) |
| Cleared for goodTurned into farms, mines or towns. | 3,110 ha | 3,010 ha (better) |
| Recent trend2021–2025 against the five years before. | Slowing down | Slowing down |
| Main known cause | Farms, pasture and plantations (61%) | Farms, pasture and plantations (82%) |
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.
Buea
2019: satellite photo from December 2018 of a 5 × 5 km area about 7 km northeast of the city center.
Kumba
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km southeast of the city center.
Trees
Which has more trees, Buea or Kumba?
Buea has more tree cover: 37.9% of the land within 2 km of its center against 26.8% around Kumba, or about 119,066 trees against 84,195.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Buea | Kumba | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 119K (better) | 84.2K |
| Trees still neededTo reach the target. Fewer is better. | 0 (better) | 10.1K |
| CO₂ absorbed each yearBy the trees already standing. | 2.6M kg (better) | 1.9M 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
Buea vs Kumba: your questions answered
Is Buea cleaner than Kumba?
On air quality, yes, right now: Buea reads AQI 31 against 63, a gap of 32 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 7 days, on modeled daily averages, Buea averaged AQI 47 against 58, and it was the cleaner of the two on 7 of those days.
Is it safe to exercise outdoors in Buea and Kumba today?
In Buea, at AQI 31: Air quality is satisfactory for everyone. In Kumba, at AQI 63: Unusually sensitive people should consider limiting long outdoor exertion.
Which has lost more forest, Buea or Kumba?
Buea has lost more: about 3,840 ha of forest within 10 km of its center from 2001 to 2025, against 3,370 ha around Kumba. 3,110 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Buea or Kumba?
Buea has more tree cover: 37.9% of the land within 2 km of its center against 26.8% around Kumba, or about 119,066 trees against 84,195. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Buea and Kumba need?
Buea needs about 0 more to reach its canopy target of 30%, and Kumba about 10,053 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Why can two places 58 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 Buea and Kumba 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 are model estimates, with no ground station close enough to either. Nothing is adjusted for population, city limits or climate.
How often does the Buea vs Kumba 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 (Feb 12, 2026 and Jun 17, 2025), and the forest figures are published yearly.
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