Alagoinhas vs Simões Filho
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.
Simões Filho has more tree cover — 57.8% against 23.2%.
Simões Filho has cleaner air right now — AQI 7 against 38.
- Tree cover gap
- 34.6 points
- Simões Filho is ahead.
- Air quality gap
- 31 AQI
- Simões Filho is cleaner.
- Trees between them
- 108K
- Simões Filho has more standing.
Brazil
Brazil
Tree cover
Share of the 2 km radius under canopy.
23.2%
57.8%
Air quality index
US EPA index, live, with its band. Lower is better.
38 · Good
7 · Good
Trees standing
Estimated from the measured canopy area.
72.9K
181K
Trees still needed
To reach the same canopy target. Fewer is better.
21.4K
0
CO₂ absorbed each year
By the trees already standing.
1.6M kg
4.0M 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. Simões Filho is read from nearby ground stations and Alagoinhas is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
9.2 µg/m³
1.6 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 | Alagoinhas | Simões Filho |
|---|---|---|
| 21 Sept | 24 | 35 |
| 22 Sept | 21 | 47 |
| 23 Sept | 28 | 43 |
| 24 Sept | 38 | 47 |
| 25 Sept | 38 | 51 |
| 26 Sept | 33 | 50 |
| 27 Sept | 41 | 40 |
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. Simões Filho leads here at 57.8%.
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: Alagoinhas reads 38 (good) and Simões Filho reads 7 (good) right now.
Frequently asked
Alagoinhas and Simões Filho, answered
Which has more trees, Alagoinhas or Simões Filho?
Simões Filho, with roughly 180,676 trees inside its 2 km radius against 72,885. Tree cover tells a slightly different story from raw count: Simões Filho has the denser canopy at 57.8%.
Which has better air quality, Alagoinhas or Simões Filho?
Simões Filho right now, at AQI 7 against 38 — a gap of 31 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?
Alagoinhas needs about 21,363 more to reach its canopy target, and Simões Filho 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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