Bratislava vs Rybnik
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.
Rybnik has more tree cover — 61.4% against 45.2%.
Bratislava has cleaner air right now — AQI 42 against 145.
- Tree cover gap
- 16.2 points
- Rybnik is ahead.
- Air quality gap
- 103 AQI
- Bratislava is cleaner.
- Trees between them
- 63.0K
- Rybnik has more standing.
Slovakia
Poland
Tree cover
Share of the 2 km radius under canopy.
45.2%
61.4%
Air quality index
US EPA index, live, with its band. Lower is better.
42 · Good
145 · Unhealthy for sensitive groups
Trees standing
Estimated from the measured canopy area.
129K
192K
Trees still needed
To reach the same canopy target. Fewer is better.
0
0
CO₂ absorbed each year
By the trees already standing.
2.8M kg
4.2M 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.
10 µg/m³
53.4 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 | Bratislava | Rybnik |
|---|---|---|
| 22 Sept | 28 | 27 |
| 23 Sept | 25 | 34 |
| 24 Sept | 38 | 43 |
| 25 Sept | 30 | 43 |
| 26 Sept | 42 | 56 |
| 27 Sept | 40 | 58 |
| 28 Sept | 50 | 70 |
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. Rybnik leads here at 61.4%.
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: Bratislava reads 42 (good) and Rybnik reads 145 (unhealthy for sensitive groups) right now.
Frequently asked
Bratislava and Rybnik, answered
Which has more trees, Bratislava or Rybnik?
Rybnik, with roughly 192,315 trees inside its 2 km radius against 129,362. Tree cover tells a slightly different story from raw count: Rybnik has the denser canopy at 61.4%.
Which has better air quality, Bratislava or Rybnik?
Bratislava right now, at AQI 42 against 145 — a gap of 103 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?
Bratislava needs about 0 more to reach its canopy target, and Rybnik about 0. 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
Other comparisons nearby
- Bratislava vs Vienna19% tree cover · AQI 58Compare
- Bratislava vs Győr33% tree cover · AQI 100Compare
- Bratislava vs Nitra45% tree cover · AQI 54Compare
- Bratislava vs Brno28% tree cover · AQI 51Compare
- Bratislava vs Gliwice52% tree cover · AQI 81Compare
- Bratislava vs Ruda Śląska74% tree cover · AQI 92Compare
Build your own
Compare Bratislava with somewhere else
This place
Bratislava
Want a different pair? Browse comparisons or measure any address.