City report · Kenya
Kisii Air quality today
Air quality in Kisii currently reads AQI 97 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 97
Moderate
- PM2.5, fine particles (µg/m³)
- 36.8
- tree cover
- 48.0%
- trees in this area
- 151K
- more trees needed
- 0
Measured across a 2 km radius around Kisii, Kenya (12.57 km²), from a satellite image of Sep 7, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Kisii · AQI 97 (Moderate)
Kisii's tree count comes to 150,796 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Kisii today: AQI 97, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 17:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 225 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 3 station cities within 225 km, e.g. Limuru Town. and Kikuyu
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
36.8
PM10
10.4
NO₂
2.0
O₃
80.0
SO₂
1.1
CO
378.0
- 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 Kisii's daily AQI at 60 on average, from 52 on Nov 7 to an hourly peak of 113 on Nov 10.
Where Kisii stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Kisii: Healthy tree cover
48.0% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
150,796
Target trees
150,796
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Kisii lost?
Since 2001, the area within 10 km of Kisii has lost about 603 hectares of forest (about 840 football pitches): 4% of the forest it had in 2000. Most of it (80%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 603 haabout 840 football pitches
- Share of its forest
- 4%of what there was in 2000
- Cleared for good
- 482 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 28 hectares a year in 2021–2025, down from 62 hectares a year in 2016–2020. The worst year was 2020, when about 215 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 | 75 ha | 10 ha | 86 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | 2 ha | under 1 ha | 2 ha |
| 2006 | 4 ha | under 1 ha | 4 ha |
| 2007 | 11 ha | 2 ha | 12 ha |
| 2008 | 3 ha | 1 ha | 4 ha |
| 2009 | 8 ha | under 1 ha | 8 ha |
| 2010 | 8 ha | under 1 ha | 9 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 6 ha | 1 ha | 7 ha |
| 2013 | 12 ha | 2 ha | 14 ha |
| 2014 | 4 ha | under 1 ha | 5 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 9 ha | 3 ha | 11 ha |
| 2017 | 28 ha | 4 ha | 32 ha |
| 2018 | 1 ha | under 1 ha | 2 ha |
| 2019 | 40 ha | 10 ha | 50 ha |
| 2020 | 161 ha | 54 ha | 215 ha |
| 2021 | 22 ha | 3 ha | 25 ha |
| 2022 | 11 ha | 2 ha | 13 ha |
| 2023 | 18 ha | 6 ha | 24 ha |
| 2024 | 28 ha | 12 ha | 40 ha |
| 2025 | 30 ha | 8 ha | 38 ha |
What is causing deforestation around Kisii?
- Towns and roadscleared for good40% · 242 ha
- Farms, pasture and plantationscleared for good40% · 240 ha
- Loggingcan grow back18% · 109 ha
Also: 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
- 19,500 ha
- Forest in 2020
- 20,000 ha
- Overall change
- +453 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Kisii grew from about 19,500 hectares to 20,000 hectares, a net gain of about 453 hectares (+2.3%). New forest grew on about 703 hectares, while 251 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
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Frequently asked
Questions about Kisii
What is the air quality (AQI) in Kisii right now?
The latest reading for Kisii shows an AQI of 97 (Moderate), observed Nov 10, 17:00 local time via Open-Meteo / CAMS, corrected with 3 ground-station cities within 225 km, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Kisii today?
At AQI 97 (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 Kisii been like this week?
Over the last 7 days, the CAMS air-quality model put Kisii's daily AQI at 60 on average, from 52 on Nov 7 to an hourly peak of 113 on Nov 10. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Kisii lost since 2001?
Since 2001, the area within 10 km of Kisii has lost about 603 hectares of forest (about 840 football pitches): 4% of the forest it had in 2000. Most of it (80%) was deforestation, forest cleared for good, mainly for towns and roads. Forest loss is slowing down: about 28 hectares a year in 2021–2025, down from 62 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Kisii grew from about 19,500 hectares to 20,000 hectares, a net gain of about 453 hectares (+2.3%). New forest grew on about 703 hectares, while 251 hectares were lost.
What is the tree count in Kisii?
Kisii has an estimated 150,796 trees across the 12.57 km² measured — 48.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Kisii need?
Kisii has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Kisii's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Kisii; the tree count is an estimate derived from that cover.
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