Banja Luka vs Osijek
Tree cover and air quality for both, measured the same way: Sentinel-2 imagery at 10 m detail over a 2 km radius from each city centre, and the live US EPA air quality index. Same radius and same index, so the two numbers compare directly.
Banja Luka has more tree cover — 29.8% against 26.1%.
Banja Luka has cleaner air right now — AQI 74 against 79.
- Tree cover gap
- 3.7 points
- Banja Luka is ahead.
- Air quality gap
- 5 AQI
- Banja Luka is cleaner.
- Trees between them
- 15.4K
- Banja Luka has more standing.
Bosnia and Herzegovina
Croatia
Tree cover
Share of the 2 km radius under canopy.
29.8%
26.1%
Air quality index
US EPA index, live, with its band. Lower is better.
74 · Moderate
79 · Moderate
Trees standing
Estimated from the measured canopy area.
93.4K
78.1K
Trees still needed
To reach the same canopy target. Fewer is better.
627
11.7K
CO₂ absorbed each year
By the trees already standing.
2.1M kg
1.7M kg
Air quality in detail
What each city is breathing
Concentrations in µg/m³, measured at the same moment as the index above. Lower is better in every row. Both are read from nearby ground stations.
PM2.5
Fine particles, the pollutant that usually sets the index.
22.9 µg/m³
25.3 µg/m³
The last week, day by day
A single reading can catch a city on a bad afternoon. The week says whether it was the weather or the place.
| Day | Banja Luka | Osijek |
|---|---|---|
| 22 Sept | 31 | 28 |
| 23 Sept | 34 | 26 |
| 24 Sept | 32 | 27 |
| 25 Sept | 34 | 28 |
| 26 Sept | 51 | 43 |
| 27 Sept | 80 | 50 |
| 28 Sept | 96 | 47 |
Reading these numbers
What is actually being measured
Tree cover
The share of ground under canopy inside a 2 km radius of each city centre, read from Sentinel-2 satellite imagery at 10 m detail. It is a measurement of that circle, not of the whole municipality — which is exactly what makes the two comparable, since city boundaries are drawn to wildly different rules around the world. Banja Luka leads here at 29.8%.
Air quality index
The live US EPA index, computed from current pollutant concentrations — ground stations where a city has them nearby, and a model everywhere else. It moves hour to hour, so this is a snapshot rather than a verdict on either place: Banja Luka reads 74 (moderate) and Osijek reads 79 (moderate) right now.
Frequently asked
Banja Luka and Osijek, answered
Which has more trees, Banja Luka or Osijek?
Banja Luka, with roughly 93,432 trees inside its 2 km radius against 78,060. Tree cover tells a slightly different story from raw count: Banja Luka has the denser canopy at 29.8%.
Which has better air quality, Banja Luka or Osijek?
Banja Luka right now, at AQI 74 against 79 — a gap of 5 points. This is a live reading rather than an annual average, so it can reverse within a day.
How many more trees does each city need?
Banja Luka needs about 627 more to reach its canopy target, and Osijek about 11,664. The target is the same share of ground for both, so the figures are directly comparable.
Are these two measured the same way?
Yes — that is the point of the page. Identical radius, identical satellite source at 10 m detail, and the same US EPA index for air. Nothing here is adjusted for population, city limits or climate, so the numbers describe the same-sized circle of ground in each place.
Keep going
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