Air quality comparison · Kenya, 705 km apart
Eldoret vs Mombasa Air quality index (AQI) today
Mombasa has cleaner air than Eldoret right now: AQI 43 (Good) against 49 (Good).
Both sit in the same EPA band, so the health advice is the same for each today. But over the past 7 days, on modeled daily averages, Eldoret averaged AQI 50 against 53, and it was the cleaner of the two on 3 of those days. Mombasa has lost more forest since 2001. Eldoret has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Eldoret49Mombasa43
Head to head
Eldoret vs Mombasa at a glance
Eldoret is ahead on 4 of 6 measures, and Mombasa on 2. The better figure in each row is marked.
| Eldoret | Mombasa | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 49 | 43 (better) |
| PM2.5Fine particles, µg/m³. | 9.9 | 7.7 (better) |
| Past week's averageUS AQI, 7 days. | 50 (better) | 53 |
| Forest lost since 2001Within 10 km of the center. | 518 ha (better) | 804 ha |
| Tree coverWithin 2 km of the center. | 19.2% (better) | 11.9% |
| Trees still neededTo reach a healthy canopy. | 33.9K (better) | 47.9K |
Air quality today
What is the air like in Eldoret and Mombasa right now?
Mombasa has cleaner air than Eldoret right now: AQI 43 (Good) against 49 (Good). PM2.5 is setting the index in both.
Both readings are model estimates, with no ground station close enough to either.
EldoretMombasa
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).
Eldoret: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
Mombasa: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
The past week
Which had cleaner air over the past 7 days?
But over the past 7 days, on modeled daily averages, Eldoret averaged AQI 50 against 53, and it was the cleaner of the two on 3 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
- Eldoret3Mombasa3
- Average AQI
- Eldoret50Mombasa53
- Worst day, AQI
- Eldoret58Mombasa57
The daily numbers (7 days)
| Day | Eldoret | Mombasa |
|---|---|---|
| Nov 4 | 58 | 57 |
| Nov 5 | 49 | 47 |
| Nov 6 | 52 | 51 |
| Nov 7 | 53 | 53 |
| Nov 8 | 48 | 57 |
| Nov 9 | 46 | 53 |
| Nov 10 | 43 | 52 |
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 Eldoret and Mombasa today?
Air quality is satisfactory for everyone. Both are in the same EPA band today (Good), so the advice is the same.
Exercise outdoors
A good day to be active outside.
Windows
Open them to air the house.
Masks
Not needed.
Air purifier
Not needed.
Against everywhere else
How do Eldoret and Mombasa compare with the rest of the world?
Right now Eldoret's air is cleaner than 62% of the 5,420 places Airleaf tracks, and Mombasa's is cleaner than 67%. Within Kenya, that is 76% and 84% of its 26 measured places.
Cleaner air than…
- Eldoret
- Beats 62%
- Mombasa
- Beats 67%
More tree cover than…
- Eldoret
- Beats 45%
- Mombasa
- Beats 26%
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, Eldoret or Mombasa?
Mombasa has lost more: about 804 ha of forest within 10 km of its center from 2001 to 2025, against 518 ha around Eldoret. 797 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: 2002, with 185 ha lost.
Worst year: 2008, with 174 ha lost.
| Eldoret | Mombasa | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 518 ha (better) | 804 ha |
| Share of its forestOf what it had in 2000. | 45% | 28% (better) |
| Cleared for goodTurned into farms, mines or towns. | 418 ha (better) | 797 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Farms, pasture and plantations (50%) | Towns and roads (86%) |
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.
Eldoret
2017: satellite photo from March 2017 of a 5 × 5 km area in the city center.
Mombasa
2018: satellite photo from November 2018 of a 5 × 5 km area about 5 km southwest of the city center.
Trees
Which has more trees, Eldoret or Mombasa?
Eldoret has more tree cover: 19.2% of the land within 2 km of its center against 11.9% around Mombasa, or about 60,319 trees against 31,478.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Eldoret | Mombasa | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 60.3K (better) | 31.5K |
| Trees still neededTo reach the target. Fewer is better. | 33.9K (better) | 47.9K |
| CO₂ absorbed each yearBy the trees already standing. | 1.3M kg (better) | 693K 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
Eldoret vs Mombasa: your questions answered
Is Mombasa cleaner than Eldoret?
On air quality, yes, right now: Mombasa reads AQI 43 against 49, a gap of 6 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. But over the past 7 days, on modeled daily averages, Eldoret averaged AQI 50 against 53, and it was the cleaner of the two on 3 of those days.
Is it safe to exercise outdoors in Eldoret and Mombasa today?
The advice is the same for both today. Air quality is satisfactory for everyone. Eldoret reads AQI 49 and Mombasa reads AQI 43.
Which has lost more forest, Eldoret or Mombasa?
Mombasa has lost more: about 804 ha of forest within 10 km of its center from 2001 to 2025, against 518 ha around Eldoret. 797 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Eldoret or Mombasa?
Eldoret has more tree cover: 19.2% of the land within 2 km of its center against 11.9% around Mombasa, or about 60,319 trees against 31,478. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Eldoret and Mombasa need?
Eldoret needs about 33,929 more to reach its canopy target of 30%, and Mombasa about 47,878 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Eldoret and Mombasa 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 Eldoret vs Mombasa 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 (Sep 7, 2026 and Sep 8, 2026), and the forest figures are published yearly.
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