City report · Osun State, Nigeria
Ilesa Air quality today
Air quality in Ilesa currently reads AQI 65 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 65
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 17.6
- tree cover
- 18.0%
- trees in this area
- 56.5K
- more trees needed
- 37.7K
Measured across a 2 km radius around Ilerin, Osun, Nigeria (12.57 km²), from a satellite image of Jan 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ilesa · AQI 65 (Moderate)
Ilesa's tree count comes to 56,549 trees across 12.57 km², 12 points below the 30% tree-cover level considered healthy for this area, so roughly 37,699 more trees would close the gap.
Air quality detail
Air quality in Ilesa today: AQI 65, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 16:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 185 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 185 km, e.g. Ibadan and Ijede
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
17.6
PM10
28.1
NO₂
2.1
O₃
95.0
SO₂
0.8
CO
312.0
- 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 Ilesa's daily AQI at 79 on average, from 69 on Nov 10 to an hourly peak of 156 on Nov 6.
Where Ilesa stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ilesa: Below target
18.0% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
56,549
Target trees
94,248
More trees needed
37,699
CO₂ if planted / yr
829.4 t
Deforestation · 2001–2025
How much forest has Ilesa lost?
Since 2001, the area within 10 km of Ilesa has lost about 3,140 hectares of forest (about 4,400 football pitches): 13% of the forest it had in 2000. Most of it (over 99%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km northeast of the city center.
- Forest lost since 2001
- 3,140 haabout 4,400 football pitches
- Share of its forest
- 13%of what there was in 2000
- Cleared for good
- 3,140 hadeforestation: turned into farms, mines or towns
Forest loss has stayed about the same: about 257 hectares a year in 2021–2025, against 248 hectares a year in 2016–2020. The worst year was 2017, when about 436 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 | 11 ha | under 1 ha | 11 ha |
| 2002 | 15 ha | under 1 ha | 15 ha |
| 2003 | 3 ha | under 1 ha | 3 ha |
| 2004 | 2 ha | under 1 ha | 2 ha |
| 2005 | 13 ha | under 1 ha | 13 ha |
| 2006 | 4 ha | under 1 ha | 4 ha |
| 2007 | 5 ha | under 1 ha | 5 ha |
| 2008 | 15 ha | under 1 ha | 15 ha |
| 2009 | 13 ha | under 1 ha | 13 ha |
| 2010 | 48 ha | under 1 ha | 48 ha |
| 2011 | 11 ha | under 1 ha | 11 ha |
| 2012 | 25 ha | under 1 ha | 25 ha |
| 2013 | 180 ha | 1 ha | 181 ha |
| 2014 | 160 ha | under 1 ha | 160 ha |
| 2015 | 114 ha | under 1 ha | 114 ha |
| 2016 | 103 ha | under 1 ha | 103 ha |
| 2017 | 436 ha | under 1 ha | 436 ha |
| 2018 | 182 ha | under 1 ha | 182 ha |
| 2019 | 178 ha | under 1 ha | 178 ha |
| 2020 | 341 ha | under 1 ha | 341 ha |
| 2021 | 298 ha | under 1 ha | 298 ha |
| 2022 | 311 ha | 1 ha | 312 ha |
| 2023 | 248 ha | under 1 ha | 248 ha |
| 2024 | 195 ha | under 1 ha | 195 ha |
| 2025 | 231 ha | 1 ha | 232 ha |
What is causing deforestation around Ilesa?
- Farms, pasture and plantationscleared for good70% · 2,200 ha
- Towns and roadscleared for good20% · 638 ha
- Mining and energycleared for good9.5% · 298 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
- 21,600 ha
- Forest in 2020
- 21,000 ha
- Overall change
- −581 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ilesa shrank from about 21,600 hectares to 21,000 hectares, a net loss of about 581 hectares (−2.7%). New forest grew on about 463 hectares, but 1,040 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 Ilesa
What is the air quality (AQI) in Ilesa right now?
The latest reading for Ilesa shows an AQI of 65 (Moderate), observed Nov 10, 16:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 185 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 Ilesa today?
At AQI 65 (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 Ilesa been like this week?
Over the last 7 days, the CAMS air-quality model put Ilesa's daily AQI at 79 on average, from 69 on Nov 10 to an hourly peak of 156 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Ilesa lost since 2001?
Since 2001, the area within 10 km of Ilesa has lost about 3,140 hectares of forest (about 4,400 football pitches): 13% of the forest it had in 2000. Most of it (over 99%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Forest loss has stayed about the same: about 257 hectares a year in 2021–2025, against 248 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Ilesa shrank from about 21,600 hectares to 21,000 hectares, a net loss of about 581 hectares (−2.7%). New forest grew on about 463 hectares, but 1,040 hectares were lost.
What is the tree count in Ilesa?
Ilesa has an estimated 56,549 trees across the 12.57 km² measured — 18.0% tree cover, 12 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Ilesa need?
Ilesa needs roughly 37,699 more trees to close a 12-point shortfall against its 30% tree-cover target — about 829.4 t of extra CO₂ absorbed per year once grown.
How are Ilesa'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 Ilerin; the tree count is an estimate derived from that cover.
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