Al Hufūf vs Az̧ Z̧a‘āyin
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.
Al Hufūf has more tree cover — 2.5% against 0.6%.
Az̧ Z̧a‘āyin has cleaner air right now — AQI 105 against 134.
- Tree cover gap
- 1.9 points
- Al Hufūf is ahead.
- Air quality gap
- 29 AQI
- Az̧ Z̧a‘āyin is cleaner.
- Trees between them
- 6.4K
- Al Hufūf has more standing.
Saudi Arabia
Qatar
Tree cover
Share of the 2 km radius under canopy.
2.5%
0.6%
Air quality index
US EPA index, live, with its band. Lower is better.
134 · Unhealthy for sensitive groups
105 · Unhealthy for sensitive groups
Trees standing
Estimated from the measured canopy area.
7.9K
1.5K
Trees still needed
To reach the same canopy target. Fewer is better.
102K
85.2K
CO₂ absorbed each year
By the trees already standing.
173K kg
32.7K 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.
48.7 µg/m³
37 µg/m³
PM10
Coarser particles — dust, pollen, road grit.
107.8 µg/m³
99.4 µg/m³
Nitrogen dioxide
Mostly traffic and combustion.
17.5 µg/m³
18.9 µg/m³
Ozone
Forms in sunlight; peaks on hot, still afternoons.
112 µg/m³
113 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 | Al Hufūf | Az̧ Z̧a‘āyin |
|---|---|---|
| 22 Sept | 133 | 122 |
| 23 Sept | 133 | 105 |
| 24 Sept | 128 | 136 |
| 25 Sept | 107 | 148 |
| 26 Sept | 109 | 129 |
| 27 Sept | 141 | 101 |
| 28 Sept | 142 | 100 |
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. Al Hufūf leads here at 2.5%.
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: Al Hufūf reads 134 (unhealthy for sensitive groups) and Az̧ Z̧a‘āyin reads 105 (unhealthy for sensitive groups) right now.
Frequently asked
Al Hufūf and Az̧ Z̧a‘āyin, answered
Which has more trees, Al Hufūf or Az̧ Z̧a‘āyin?
Al Hufūf, with roughly 7,854 trees inside its 2 km radius against 1,485. Tree cover tells a slightly different story from raw count: Al Hufūf has the denser canopy at 2.5%.
Which has better air quality, Al Hufūf or Az̧ Z̧a‘āyin?
Az̧ Z̧a‘āyin right now, at AQI 105 against 134 — a gap of 29 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?
Al Hufūf needs about 102,102 more to reach its canopy target, and Az̧ Z̧a‘āyin about 85,160. 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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