Port-au-Prince vs Tigwav
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.
Tigwav has more tree cover — 63.0% against 22.8%.
Tigwav has cleaner air right now — AQI 127 against 158.
- Tree cover gap
- 40.2 points
- Tigwav is ahead.
- Air quality gap
- 31 AQI
- Tigwav is cleaner.
- Trees between them
- 54.4K
- Tigwav has more standing.
Haiti
Haiti
Tree cover
Share of the 2 km radius under canopy.
22.8%
63.0%
Air quality index
US EPA index, live, with its band. Lower is better.
158 · Unhealthy
127 · Unhealthy for sensitive groups
Trees standing
Estimated from the measured canopy area.
65.2K
120K
Trees still needed
To reach the same canopy target. Fewer is better.
49.2K
0
CO₂ absorbed each year
By the trees already standing.
1.4M kg
2.6M 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.
PM2.5
Fine particles, the pollutant that usually sets the index.
69.4 µg/m³
46.1 µg/m³
PM10
Coarser particles — dust, pollen, road grit.
77.8 µg/m³
52.5 µg/m³
Nitrogen dioxide
Mostly traffic and combustion.
32.8 µg/m³
14.1 µg/m³
Ozone
Forms in sunlight; peaks on hot, still afternoons.
27 µg/m³
28 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 | Port-au-Prince | Tigwav |
|---|---|---|
| 22 Sept | 99 | 82 |
| 23 Sept | 74 | 75 |
| 24 Sept | 66 | 60 |
| 25 Sept | 66 | 56 |
| 26 Sept | 64 | 66 |
| 27 Sept | 76 | 73 |
| 28 Sept | 158 | 127 |
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. Tigwav leads here at 63.0%.
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: Port-au-Prince reads 158 (unhealthy) and Tigwav reads 127 (unhealthy for sensitive groups) right now.
Frequently asked
Port-au-Prince and Tigwav, answered
Which has more trees, Port-au-Prince or Tigwav?
Tigwav, with roughly 119,544 trees inside its 2 km radius against 65,182. Tree cover tells a slightly different story from raw count: Tigwav has the denser canopy at 63.0%.
Which has better air quality, Port-au-Prince or Tigwav?
Tigwav right now, at AQI 127 against 158 — 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?
Port-au-Prince needs about 49,172 more to reach its canopy target, and Tigwav 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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