Centurion vs Ermelo
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.
Ermelo has more tree cover — 40.6% against 24.4%.
Ermelo has cleaner air right now — AQI 34 against 103.
- Tree cover gap
- 16.2 points
- Ermelo is ahead.
- Air quality gap
- 69 AQI
- Ermelo is cleaner.
- Trees between them
- 50.6K
- Ermelo has more standing.
Tree cover
Share of the 2 km radius under canopy.
24.4%
40.6%
Air quality index
US EPA index, live, with its band. Lower is better.
103 · Unhealthy for sensitive groups
34 · Good
Trees standing
Estimated from the measured canopy area.
76.6K
127K
Trees still needed
To reach the same canopy target. Fewer is better.
33.3K
0
CO₂ absorbed each year
By the trees already standing.
1.7M kg
2.8M 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. Centurion is read from nearby ground stations and Ermelo is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
36.3 µg/m³
0.9 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 | Centurion | Ermelo |
|---|---|---|
| 22 Sept | 91 | 51 |
| 23 Sept | 69 | 66 |
| 24 Sept | 85 | 72 |
| 25 Sept | 103 | 59 |
| 26 Sept | 74 | 57 |
| 27 Sept | 72 | 54 |
| 28 Sept | 66 | 36 |
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. Ermelo leads here at 40.6%.
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: Centurion reads 103 (unhealthy for sensitive groups) and Ermelo reads 34 (good) right now.
Frequently asked
Centurion and Ermelo, answered
Which has more trees, Centurion or Ermelo?
Ermelo, with roughly 127,166 trees inside its 2 km radius against 76,578. Tree cover tells a slightly different story from raw count: Ermelo has the denser canopy at 40.6%.
Which has better air quality, Centurion or Ermelo?
Ermelo right now, at AQI 34 against 103 — a gap of 69 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?
Centurion needs about 33,268 more to reach its canopy target, and Ermelo 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
Other comparisons nearby
- Centurion vs Pretoria10% tree cover · AQI 103Compare
- Centurion vs Thembisa5% tree cover · AQI 53Compare
- Centurion vs Randburg40% tree cover · AQI 127Compare
- Centurion vs Benoni15% tree cover · AQI 53Compare
- Centurion vs Standerton29% tree cover · AQI 33Compare
- Centurion vs eMbalenhle24% tree cover · AQI 32Compare
Build your own
Compare Centurion with somewhere else
This place
Centurion
Want a different pair? Browse comparisons or measure any address.