Air quality comparison · Liberia, 103.1 mi (166 km) apart
Gbarnga vs Monrovia Air quality index (AQI) today
Gbarnga has cleaner air than Monrovia right now: AQI 31 (Good) against 81 (Moderate).
That puts them in different EPA bands, so the health advice differs today. Over the past 6 days, on modeled daily averages, Gbarnga averaged AQI 41 against 48, and it was the cleaner of the two on 5 of those days. Gbarnga has lost more forest since 2001. Gbarnga has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Gbarnga31Monrovia81
Head to head
Gbarnga vs Monrovia at a glance
Gbarnga is ahead on 5 of 6 measures, and Monrovia on 1. The better figure in each row is marked.
| Gbarnga | Monrovia | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 31 (better) | 81 |
| PM2.5Fine particles, µg/m³. | 6.1 (better) | 25.3 |
| Past week's averageUS AQI, 6 days. | 41 (better) | 48 |
| Forest lost since 2001Within 10 km of the center. | 15,800 ha | 53 ha (better) |
| Tree coverWithin 1.2 mi (2 km) of the center. | 48.1% (better) | 25.1% |
| Trees still neededTo reach a healthy canopy. | 0 (better) | 6.5K |
Air quality today
What is the air like in Gbarnga and Monrovia right now?
Gbarnga has cleaner air than Monrovia right now: AQI 31 (Good) against 81 (Moderate). PM2.5 is setting the index in both.
Monrovia's PM2.5 is about 1.7× the WHO's 24-hour guideline of 15 µg/m³.
Monrovia is read from a nearby ground station and Gbarnga is a model estimate, so the two are not quite like for like.
GbarngaMonrovia
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).
Gbarnga: Model estimate · no ground station nearby. Data: Open-Meteo / CAMS, US EPA index.
Monrovia: Ground station · Duport Road_Soko Sackor Compound (UMU-EPIC Liberia), 8.5 mi (13.6 km) away. Data: OpenAQ · AirGradient, United Methodist University.
The past week
Which had cleaner air over the past 6 days?
Over the past 6 days, on modeled daily averages, Gbarnga averaged AQI 41 against 48, and it was the cleaner of the two on 5 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
- Gbarnga5Monrovia1
- Average AQI
- Gbarnga41Monrovia48
- Worst day, AQI
- Gbarnga47Monrovia57
The daily numbers (6 days)
| Day | Gbarnga | Monrovia |
|---|---|---|
| Nov 5 | 37 | 34 |
| Nov 6 | 46 | 53 |
| Nov 7 | 36 | 46 |
| Nov 8 | 43 | 47 |
| Nov 9 | 47 | 57 |
| Nov 10 | 38 | 49 |
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 Gbarnga and Monrovia today?
Gbarnga (AQI 31, Good): Air quality is satisfactory for everyone.
Monrovia (AQI 81, Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Exercise outdoors
- Gbarnga
- A good day to be active outside.
- Monrovia
- Fine for most people; unusually sensitive people should take long or hard exercise easier.
Windows
- Gbarnga
- Open them to air the house.
- Monrovia
- Fine to open; close them if you are sensitive to pollution.
Masks
- Gbarnga
- Not needed.
- Monrovia
- Not needed for most people.
Air purifier
- Gbarnga
- Not needed.
- Monrovia
- Worth running if you are sensitive.
Against everywhere else
How do Gbarnga and Monrovia compare with the rest of the world?
Right now Gbarnga's air is cleaner than 78% of the 5,420 places Airleaf tracks, and Monrovia's is cleaner than 30%. Within Liberia, that is 75% and 0% of its 5 measured places.
Cleaner air than…
- Gbarnga
- Beats 78%
- Monrovia
- Beats 30%
More tree cover than…
- Gbarnga
- Beats 91%
- Monrovia
- Beats 58%
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, Gbarnga or Monrovia?
Gbarnga has lost more: about 15,800 ha of forest within 10 km of its center from 2001 to 2025, against 53 ha around Monrovia. 9,250 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: 2013, with 1,810 ha lost.
Worst year: 2006, with 16 ha lost.
| Gbarnga | Monrovia | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 15,800 ha | 53 ha (better) |
| Share of its forestOf what it had in 2000. | 59% | 4.3% (better) |
| Cleared for goodTurned into farms, mines or towns. | 9,250 ha | 49 ha (better) |
| Recent trend2021–2025 against the five years before. | Slowing down | Too little to call |
| Main known cause | Farms, pasture and plantations (54%) | Towns and roads (92%) |
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.
Gbarnga
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km south of the city center.
Monrovia
2017: satellite photo from February 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Gbarnga or Monrovia?
Gbarnga has more tree cover: 48.1% of the land within 1.2 mi (2 km) of its center against 25.1% around Monrovia, or about 151,111 trees against 33,198.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Gbarnga | Monrovia | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 151K (better) | 33.2K |
| Trees still neededTo reach the target. Fewer is better. | 0 (better) | 6.5K |
| CO₂ absorbed each yearBy the trees already standing. | 3.3M kg (better) | 730K kg |
Tree cover on the satellite image
The same 1.2 mi (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 1.2 mi (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
Gbarnga vs Monrovia: your questions answered
Is Gbarnga cleaner than Monrovia?
On air quality, yes, right now: Gbarnga reads AQI 31 against 81, a gap of 50 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 6 days, on modeled daily averages, Gbarnga averaged AQI 41 against 48, and it was the cleaner of the two on 5 of those days.
Is it safe to exercise outdoors in Gbarnga and Monrovia today?
In Gbarnga, at AQI 31: Air quality is satisfactory for everyone. In Monrovia, at AQI 81: Unusually sensitive people should consider limiting long outdoor exertion.
Which has lost more forest, Gbarnga or Monrovia?
Gbarnga has lost more: about 15,800 ha of forest within 10 km of its center from 2001 to 2025, against 53 ha around Monrovia. 9,250 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Gbarnga or Monrovia?
Gbarnga has more tree cover: 48.1% of the land within 1.2 mi (2 km) of its center against 25.1% around Monrovia, or about 151,111 trees against 33,198. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Gbarnga and Monrovia need?
Gbarnga needs about 0 more to reach its canopy target of 30%, and Monrovia about 6,481 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Gbarnga and Monrovia 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. Monrovia is read from a nearby ground station and Gbarnga 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 Gbarnga vs Monrovia 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 (Mar 10, 2026 and Oct 31, 2026), and the forest figures are published yearly.
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