Air quality comparison · Guinea, 570 km apart
Conakry vs Nzérékoré Air quality index (AQI) today
Nzérékoré has cleaner air than Conakry right now: AQI 62 (Moderate) against 89 (Moderate).
Both sit in the same EPA band, so the health advice is the same for each today. Over the past 7 days, on modeled daily averages, Nzérékoré averaged AQI 54 against 56, and it was the cleaner of the two on 4 of those days. Nzérékoré has lost more forest since 2001. Nzérékoré has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Conakry89Nzérékoré62
Head to head
Conakry vs Nzérékoré at a glance
Nzérékoré is ahead on 5 of 6 measures, and Conakry on 1. The better figure in each row is marked.
| Conakry | Nzérékoré | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 89 | 62 (better) |
| PM2.5Fine particles, µg/m³. | 29.6 | 13.7 (better) |
| Past week's averageUS AQI, 7 days. | 56 | 54 (better) |
| Forest lost since 2001Within 10 km of the center. | 1 ha (better) | 7,420 ha |
| Tree coverWithin 2 km of the center. | 9.1% | 22.7% (better) |
| Trees still neededTo reach a healthy canopy. | 33.6K | 22.9K (better) |
Air quality today
What is the air like in Conakry and Nzérékoré right now?
Nzérékoré has cleaner air than Conakry right now: AQI 62 (Moderate) against 89 (Moderate). PM2.5 is setting the index in both.
Conakry's PM2.5 is about 2.0× the WHO's 24-hour guideline of 15 µg/m³.
Conakry is read from a nearby ground station and Nzérékoré is a model estimate, so the two are not quite like for like.
ConakryNzérékoré
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).
Conakry: Ground station · CSIG, 5.4 km away. Data: OpenAQ · AirGradient, CSIG.
Nzérékoré: 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?
Over the past 7 days, on modeled daily averages, Nzérékoré averaged AQI 54 against 56, and it was the cleaner of the two on 4 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
- Conakry3Nzérékoré4
- Average AQI
- Conakry56Nzérékoré54
- Worst day, AQI
- Conakry74Nzérékoré60
The daily numbers (7 days)
| Day | Conakry | Nzérékoré |
|---|---|---|
| Nov 4 | 29 | 48 |
| Nov 5 | 42 | 50 |
| Nov 6 | 57 | 59 |
| Nov 7 | 62 | 59 |
| Nov 8 | 74 | 44 |
| Nov 9 | 66 | 60 |
| Nov 10 | 62 | 57 |
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 Conakry and Nzérékoré today?
Unusually sensitive people should consider limiting long outdoor exertion. Both are in the same EPA band today (Moderate), so the advice is the same.
Exercise outdoors
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.
Air purifier
Worth running if you are sensitive.
Against everywhere else
How do Conakry and Nzérékoré compare with the rest of the world?
Right now Conakry's air is cleaner than 25% of the 5,420 places Airleaf tracks, and Nzérékoré's is cleaner than 45%. Within Guinea, that is 44% and 89% of its 10 measured places.
Cleaner air than…
- Conakry
- Beats 25%
- Nzérékoré
- Beats 45%
More tree cover than…
- Conakry
- Beats 19%
- Nzérékoré
- Beats 53%
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, Conakry or Nzérékoré?
Nzérékoré has lost more: about 7,420 ha of forest within 10 km of its center from 2001 to 2025, against 1 ha around Conakry. 4,440 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: 2001, with under 1 ha lost.
Worst year: 2020, with 794 ha lost.
| Conakry | Nzérékoré | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 1 ha (better) | 7,420 ha |
| Cleared for goodTurned into farms, mines or towns. | 1 ha (better) | 4,440 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Holding steady |
| Main known cause | Towns and roads (69%) | Farms, pasture and plantations (44%) |
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.
Conakry
2017: satellite photo from January 2017 of a 5 × 5 km area in the city center.
Nzérékoré
2017: satellite photo from February 2017 of a 5 × 5 km area about 7 km west of the city center.
Trees
Which has more trees, Conakry or Nzérékoré?
Nzérékoré has more tree cover: 22.7% of the land within 2 km of its center against 9.1% around Conakry, or about 71,314 trees against 14,609.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Conakry | Nzérékoré | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 14.6K | 71.3K (better) |
| Trees still neededTo reach the target. Fewer is better. | 33.6K | 22.9K (better) |
| CO₂ absorbed each yearBy the trees already standing. | 321K kg | 1.6M kg (better) |
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
Conakry vs Nzérékoré: your questions answered
Is Nzérékoré cleaner than Conakry?
On air quality, yes, right now: Nzérékoré reads AQI 62 against 89, a gap of 27 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. Over the past 7 days, on modeled daily averages, Nzérékoré averaged AQI 54 against 56, and it was the cleaner of the two on 4 of those days.
Is it safe to exercise outdoors in Conakry and Nzérékoré today?
The advice is the same for both today. Unusually sensitive people should consider limiting long outdoor exertion. Conakry reads AQI 89 and Nzérékoré reads AQI 62.
Which has lost more forest, Conakry or Nzérékoré?
Nzérékoré has lost more: about 7,420 ha of forest within 10 km of its center from 2001 to 2025, against 1 ha around Conakry. 4,440 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Conakry or Nzérékoré?
Nzérékoré has more tree cover: 22.7% of the land within 2 km of its center against 9.1% around Conakry, or about 71,314 trees against 14,609. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Conakry and Nzérékoré need?
Conakry needs about 33,552 more to reach its canopy target of 30%, and Nzérékoré about 22,934 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Conakry and Nzérékoré 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. Conakry is read from a nearby ground station and Nzérékoré is a model estimate, so the two are not quite like for like. Nothing is adjusted for population, city limits or climate.
How often does the Conakry vs Nzérékoré 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 May 1, 2026), and the forest figures are published yearly.
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