City report · Machakos County, Kenya
Mlolongo Air quality today
Air quality in Mlolongo currently reads AQI 108 (Unhealthy for sensitive groups): Sensitive groups should limit long or intense outdoor activity.
AQI 108
Air quality right now
Unhealthy for sensitive groups
- PM2.5, fine particles (µg/m³)
- 47.0
- tree cover
- 4.4%
- trees in this area
- 13.8K
- more trees needed
- 96.1K
Measured across a 2 km radius around Mlolongo, Kenya (12.57 km²), from a satellite image of Sep 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Mlolongo · AQI 108 (Unhealthy for sensitive groups)
Mlolongo's tree count comes to 13,823 trees across 12.57 km², 31 points below the 35% tree-cover level considered healthy for this area, so roughly 96,133 more trees would close the gap.
Air quality detail
Air quality in Mlolongo today: AQI 108, Unhealthy for sensitive groups
Main pollutant: PM2.5 · Observed Nov 11, 07:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 25 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 25 km, e.g. Nairobi and Ongata Rongai
Health signal
Sensitive groups should limit long or intense outdoor activity.
PM2.5
47.0
PM10
13.0
NO₂
10.2
O₃
44.0
SO₂
6.6
CO
366.0
- Outdoor exercise
- Children, older adults and people with asthma or heart disease should cut down long or hard exercise
- Windows
- Close them to keep the outside air out
- Mask
- Sensitive groups: an N95 outdoors
- Air purifier
- Run one, especially in bedrooms
Over the last 7 days, the CAMS air-quality model put Mlolongo's daily AQI at 44 on average, from 41 on Nov 5 to an hourly peak of 59 on Nov 5.
Where Mlolongo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Mlolongo: Critically low
4.4% tree cover against a 35% healthy-neighborhood target, across 12.57 km².
Trees in this area
13,823
Target trees
109,956
More trees needed
96,133
CO₂ if planted / yr
2,115 t
Deforestation · 2001–2025
How much forest has Mlolongo lost?
There was almost no forest around Mlolongo in 2000, so there has been almost nothing to lose since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
2017: satellite photo from January 2017 of a 5 × 5 km area in the city center.
Forest gained and lost, 2000–2020
- Forest in 2000
- 262 ha
- Forest in 2020
- 279 ha
- Overall change
- +17 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Mlolongo grew from about 262 hectares to 279 hectares, a net gain of about 17 hectares (+6.5%). New forest grew on about 25 hectares, while 9 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 Mlolongo
What is the air quality (AQI) in Mlolongo right now?
The latest reading for Mlolongo shows an AQI of 108 (Unhealthy for sensitive groups), observed Nov 11, 07:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 25 km, US EPA index. The main pollutant is PM2.5. Sensitive groups should limit long or intense outdoor activity.
Is it safe to exercise outside in Mlolongo today?
At AQI 108 (Unhealthy for sensitive groups): children, older adults and people with asthma or heart disease should cut down long or hard exercise. Windows: close them to keep the outside air out. Masks: sensitive groups: an N95 outdoors. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Mlolongo been like this week?
Over the last 7 days, the CAMS air-quality model put Mlolongo's daily AQI at 44 on average, from 41 on Nov 5 to an hourly peak of 59 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Mlolongo lost since 2001?
There was almost no forest around Mlolongo in 2000, so there has been almost nothing to lose since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here. Comparing satellite maps from 2000 and 2020, the forest around Mlolongo grew from about 262 hectares to 279 hectares, a net gain of about 17 hectares (+6.5%). New forest grew on about 25 hectares, while 9 hectares were lost.
What is the tree count in Mlolongo?
Mlolongo has an estimated 13,823 trees across the 12.57 km² measured — 4.4% tree cover, 31 percentage points short of the 35% tree-cover target set for this area.
How many more trees does Mlolongo need?
Mlolongo needs roughly 96,133 more trees to close a 31-point shortfall against its 35% tree-cover target — about 2,115 t of extra CO₂ absorbed per year once grown.
How are Mlolongo'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 Mlolongo; the tree count is an estimate derived from that cover.
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