Asunción vs Caxias do Sul
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.
Asunción has more tree cover — 20.9% against 19.7%.
Caxias do Sul has cleaner air right now — AQI 29 against 82.
- Tree cover gap
- 1.2 points
- Asunción is ahead.
- Air quality gap
- 53 AQI
- Caxias do Sul is cleaner.
- Trees between them
- 4.4K
- Caxias do Sul has more standing.
Paraguay
Brazil
Tree cover
Share of the 2 km radius under canopy.
20.9%
19.7%
Air quality index
US EPA index, live, with its band. Lower is better.
82 · Moderate
29 · Good
Trees standing
Estimated from the measured canopy area.
57.5K
61.9K
Trees still needed
To reach the same canopy target. Fewer is better.
25.0K
32.4K
CO₂ absorbed each year
By the trees already standing.
1.3M kg
1.4M 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. Asunción is read from nearby ground stations and Caxias do Sul is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
26.9 µg/m³
6.9 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 | Asunción | Caxias do Sul |
|---|---|---|
| 22 Sept | 25 | 23 |
| 23 Sept | 29 | 34 |
| 24 Sept | 40 | 40 |
| 25 Sept | 44 | 32 |
| 26 Sept | 36 | 45 |
| 27 Sept | 47 | 45 |
| 28 Sept | 41 | 41 |
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. Asunción leads here at 20.9%.
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: Asunción reads 82 (moderate) and Caxias do Sul reads 29 (good) right now.
Frequently asked
Asunción and Caxias do Sul, answered
Which has more trees, Asunción or Caxias do Sul?
Caxias do Sul, with roughly 61,889 trees inside its 2 km radius against 57,452. Tree cover tells a slightly different story from raw count: Asunción has the denser canopy at 20.9%.
Which has better air quality, Asunción or Caxias do Sul?
Caxias do Sul right now, at AQI 29 against 82 — a gap of 53 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?
Asunción needs about 25,015 more to reach its canopy target, and Caxias do Sul about 32,358. 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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