Chernivtsi vs Cluj-Napoca
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.
Chernivtsi has more tree cover — 56.5% against 35.8%.
Cluj-Napoca has cleaner air right now — AQI 30 against 41.
- Tree cover gap
- 20.7 points
- Chernivtsi is ahead.
- Air quality gap
- 11 AQI
- Cluj-Napoca is cleaner.
- Trees between them
- 65.0K
- Chernivtsi has more standing.
Ukraine
Romania
Tree cover
Share of the 2 km radius under canopy.
56.5%
35.8%
Air quality index
US EPA index, live, with its band. Lower is better.
41 · Good
30 · Good
Trees standing
Estimated from the measured canopy area.
177K
112K
Trees still needed
To reach the same canopy target. Fewer is better.
0
0
CO₂ absorbed each year
By the trees already standing.
3.9M kg
2.5M 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. Cluj-Napoca is read from nearby ground stations and Chernivtsi is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
9.8 µg/m³
7.2 µg/m³
PM10
Coarser particles — dust, pollen, road grit.
12.4 µg/m³
10.3 µg/m³
Nitrogen dioxide
Mostly traffic and combustion.
9 µg/m³
39.1 µg/m³
Ozone
Forms in sunlight; peaks on hot, still afternoons.
26 µg/m³
32.7 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 | Chernivtsi | Cluj-Napoca |
|---|---|---|
| 22 Sept | 22 | 26 |
| 23 Sept | 22 | 23 |
| 24 Sept | 27 | 28 |
| 25 Sept | 28 | 36 |
| 26 Sept | 43 | 45 |
| 27 Sept | 49 | 41 |
| 28 Sept | 54 | 48 |
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. Chernivtsi leads here at 56.5%.
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: Chernivtsi reads 41 (good) and Cluj-Napoca reads 30 (good) right now.
Frequently asked
Chernivtsi and Cluj-Napoca, answered
Which has more trees, Chernivtsi or Cluj-Napoca?
Chernivtsi, with roughly 177,322 trees inside its 2 km radius against 112,357. Tree cover tells a slightly different story from raw count: Chernivtsi has the denser canopy at 56.5%.
Which has better air quality, Chernivtsi or Cluj-Napoca?
Cluj-Napoca right now, at AQI 30 against 41 — a gap of 11 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?
Chernivtsi needs about 0 more to reach its canopy target, and Cluj-Napoca 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
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