Klagenfurt am Wörthersee vs Novo Mesto
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.
Novo Mesto has more tree cover — 65.1% against 48.6%.
Klagenfurt am Wörthersee has cleaner air right now — AQI 47 against 63.
- Tree cover gap
- 16.5 points
- Novo Mesto is ahead.
- Air quality gap
- 16 AQI
- Klagenfurt am Wörthersee is cleaner.
- Trees between them
- 50.2K
- Novo Mesto has more standing.
Austria
Slovenia
Tree cover
Share of the 2 km radius under canopy.
48.6%
65.1%
Air quality index
US EPA index, live, with its band. Lower is better.
47 · Good
63 · Moderate
Trees standing
Estimated from the measured canopy area.
153K
203K
Trees still needed
To reach the same canopy target. Fewer is better.
0
0
CO₂ absorbed each year
By the trees already standing.
3.4M kg
4.5M 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. Klagenfurt am Wörthersee is read from nearby ground stations and Novo Mesto is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
11.2 µg/m³
17.6 µg/m³
PM10
Coarser particles — dust, pollen, road grit.
15.7 µg/m³
26.2 µg/m³
Nitrogen dioxide
Mostly traffic and combustion.
8.6 µg/m³
8.7 µg/m³
Ozone
Forms in sunlight; peaks on hot, still afternoons.
12.5 µg/m³
45 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 | Klagenfurt am Wörthersee | Novo Mesto |
|---|---|---|
| 22 Sept | 31 | 29 |
| 23 Sept | 30 | 28 |
| 24 Sept | 35 | 30 |
| 25 Sept | 30 | 32 |
| 26 Sept | 42 | 32 |
| 27 Sept | 45 | 52 |
| 28 Sept | 62 | 65 |
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. Novo Mesto leads here at 65.1%.
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: Klagenfurt am Wörthersee reads 47 (good) and Novo Mesto reads 63 (moderate) right now.
Frequently asked
Klagenfurt am Wörthersee and Novo Mesto, answered
Which has more trees, Klagenfurt am Wörthersee or Novo Mesto?
Novo Mesto, with roughly 202,882 trees inside its 2 km radius against 152,681. Tree cover tells a slightly different story from raw count: Novo Mesto has the denser canopy at 65.1%.
Which has better air quality, Klagenfurt am Wörthersee or Novo Mesto?
Klagenfurt am Wörthersee right now, at AQI 47 against 63 — a gap of 16 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?
Klagenfurt am Wörthersee needs about 0 more to reach its canopy target, and Novo Mesto 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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