City report · Kwara State, Nigeria
Offa Air quality today
Air quality in Offa currently reads AQI 68 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
AQI 68
Air quality right now
Moderate
- PM2.5, fine particles (µg/m³)
- 18.8
- tree cover
- 18.6%
- trees in this area
- 58.4K
- more trees needed
- 35.8K
Measured across a 2 km radius around Offa, Kwara, Nigeria (12.57 km²), from a satellite image of Oct 31, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Offa · AQI 68 (Moderate)
Offa's tree count comes to 58,434 trees across 12.57 km², 11 points below the 30% tree-cover level considered healthy for this area, so roughly 35,814 more trees would close the gap.
Air quality detail
Air quality in Offa today: AQI 68, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 16:00 local time via Open-Meteo / CAMS, corrected with 2 ground-station cities within 225 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 2 station cities within 225 km, e.g. Ibadan and Ijede
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
18.8
PM10
30.5
NO₂
2.4
O₃
100.0
SO₂
0.9
CO
323.0
- 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 Offa's daily AQI at 82 on average, from 70 on Nov 10 to an hourly peak of 153 on Nov 7.
Where Offa stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Offa: Below target
18.6% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
58,434
Target trees
94,248
More trees needed
35,814
CO₂ if planted / yr
787.9 t
Deforestation · 2001–2025
How much forest has Offa lost?
Since 2001, the area within 10 km of Offa has lost about 930 hectares of forest (about 1,300 football pitches): 35% 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 southeast of the city center.
- Forest lost since 2001
- 930 haabout 1,300 football pitches
- Share of its forest
- 35%of what there was in 2000
- Cleared for good
- 929 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 31 hectares a year in 2021–2025, down from 138 hectares a year in 2016–2020. The worst year was 2017, when about 294 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 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | 23 ha | under 1 ha | 23 ha |
| 2003 | 13 ha | under 1 ha | 13 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | 3 ha | under 1 ha | 3 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | 2 ha | under 1 ha | 2 ha |
| 2008 | 2 ha | under 1 ha | 2 ha |
| 2009 | 10 ha | under 1 ha | 10 ha |
| 2010 | 4 ha | under 1 ha | 4 ha |
| 2011 | 2 ha | under 1 ha | 2 ha |
| 2012 | 10 ha | under 1 ha | 10 ha |
| 2013 | 1 ha | under 1 ha | 1 ha |
| 2014 | 5 ha | under 1 ha | 5 ha |
| 2015 | 7 ha | under 1 ha | 7 ha |
| 2016 | 75 ha | under 1 ha | 75 ha |
| 2017 | 294 ha | under 1 ha | 294 ha |
| 2018 | 224 ha | 1 ha | 225 ha |
| 2019 | 41 ha | under 1 ha | 41 ha |
| 2020 | 57 ha | under 1 ha | 57 ha |
| 2021 | 31 ha | under 1 ha | 31 ha |
| 2022 | 37 ha | under 1 ha | 37 ha |
| 2023 | 29 ha | under 1 ha | 29 ha |
| 2024 | 46 ha | under 1 ha | 46 ha |
| 2025 | 15 ha | under 1 ha | 15 ha |
What is causing deforestation around Offa?
- Farms, pasture and plantationscleared for good98% · 916 ha
- Towns and roadscleared for good1.4% · 13 ha
Also: shifting farming.
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
- 15,700 ha
- Forest in 2020
- 16,100 ha
- Overall change
- +427 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Offa grew from about 15,700 hectares to 16,100 hectares, a net gain of about 427 hectares (+2.7%). New forest grew on about 1,480 hectares, while 1,050 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 Offa
What is the air quality (AQI) in Offa right now?
The latest reading for Offa shows an AQI of 68 (Moderate), observed Nov 10, 16:00 local time via Open-Meteo / CAMS, corrected with 2 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 Offa today?
At AQI 68 (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 Offa been like this week?
Over the last 7 days, the CAMS air-quality model put Offa's daily AQI at 82 on average, from 70 on Nov 10 to an hourly peak of 153 on Nov 7. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Offa lost since 2001?
Since 2001, the area within 10 km of Offa has lost about 930 hectares of forest (about 1,300 football pitches): 35% 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 is slowing down: about 31 hectares a year in 2021–2025, down from 138 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Offa grew from about 15,700 hectares to 16,100 hectares, a net gain of about 427 hectares (+2.7%). New forest grew on about 1,480 hectares, while 1,050 hectares were lost.
What is the tree count in Offa?
Offa has an estimated 58,434 trees across the 12.57 km² measured — 18.6% tree cover, 11 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Offa need?
Offa needs roughly 35,814 more trees to close a 11-point shortfall against its 30% tree-cover target — about 787.9 t of extra CO₂ absorbed per year once grown.
How are Offa'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 Offa; the tree count is an estimate derived from that cover.
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