Arezzo vs Pisa
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.
Arezzo has more tree cover — 53.4% against 36.6%.
Pisa has cleaner air right now — AQI 27 against 29.
- Tree cover gap
- 16.8 points
- Arezzo is ahead.
- Air quality gap
- 2 AQI
- Pisa is cleaner.
- Trees between them
- 55.5K
- Arezzo has more standing.
Tree cover
Share of the 2 km radius under canopy.
53.4%
36.6%
Air quality index
US EPA index, live, with its band. Lower is better.
29 · Good
27 · Good
Trees standing
Estimated from the measured canopy area.
168K
112K
Trees still needed
To reach the same canopy target. Fewer is better.
0
0
CO₂ absorbed each year
By the trees already standing.
3.7M 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. Both are modelled, with no ground station close enough to either.
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 | Arezzo | Pisa |
|---|---|---|
| 22 Sept | 35 | 38 |
| 23 Sept | 31 | 34 |
| 24 Sept | 30 | 39 |
| 25 Sept | 34 | 36 |
| 26 Sept | 31 | 31 |
| 27 Sept | 30 | 29 |
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. Arezzo leads here at 53.4%.
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: Arezzo reads 29 (good) and Pisa reads 27 (good) right now.
Frequently asked
Arezzo and Pisa, answered
Which has more trees, Arezzo or Pisa?
Arezzo, with roughly 167,761 trees inside its 2 km radius against 112,223. Tree cover tells a slightly different story from raw count: Arezzo has the denser canopy at 53.4%.
Which has better air quality, Arezzo or Pisa?
Pisa right now, at AQI 27 against 29 — a gap of 2 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?
Arezzo needs about 0 more to reach its canopy target, and Pisa 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.
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