Castelló de la Plana vs Tarragona
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.
Tarragona has more tree cover — 35.8% against 11.0%.
Castelló de la Plana has cleaner air right now — AQI 18 against 31.
- Tree cover gap
- 24.8 points
- Tarragona is ahead.
- Air quality gap
- 13 AQI
- Castelló de la Plana is cleaner.
- Trees between them
- 62.5K
- Tarragona has more standing.
Spain
Spain
Tree cover
Share of the 2 km radius under canopy.
11.0%
35.8%
Air quality index
US EPA index, live, with its band. Lower is better.
18 · Good
31 · Good
Trees standing
Estimated from the measured canopy area.
34.6K
97.1K
Trees still needed
To reach the same canopy target. Fewer is better.
59.7K
0
CO₂ absorbed each year
By the trees already standing.
760K kg
2.1M 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. Castelló de la Plana is read from nearby ground stations and Tarragona is modelled — worth knowing, since the two are not quite like for like.
PM2.5
Fine particles, the pollutant that usually sets the index.
4 µg/m³
6 µg/m³
PM10
Coarser particles — dust, pollen, road grit.
12.5 µg/m³
11.5 µg/m³
Nitrogen dioxide
Mostly traffic and combustion.
37.5 µg/m³
14.7 µg/m³
Ozone
Forms in sunlight; peaks on hot, still afternoons.
13 µg/m³
70 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 | Castelló de la Plana | Tarragona |
|---|---|---|
| 22 Sept | 34 | 39 |
| 23 Sept | 40 | 41 |
| 24 Sept | 44 | 38 |
| 25 Sept | 45 | 38 |
| 26 Sept | 46 | 45 |
| 27 Sept | 40 | 42 |
| 28 Sept | 37 | 38 |
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. Tarragona leads here at 35.8%.
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: Castelló de la Plana reads 18 (good) and Tarragona reads 31 (good) right now.
Frequently asked
Castelló de la Plana and Tarragona, answered
Which has more trees, Castelló de la Plana or Tarragona?
Tarragona, with roughly 97,061 trees inside its 2 km radius against 34,558. Tree cover tells a slightly different story from raw count: Tarragona has the denser canopy at 35.8%.
Which has better air quality, Castelló de la Plana or Tarragona?
Castelló de la Plana right now, at AQI 18 against 31 — a gap of 13 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?
Castelló de la Plana needs about 59,690 more to reach its canopy target, and Tarragona 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
- Castelló de la Plana vs Valencia13% tree cover · AQI 38Compare
- Castelló de la Plana vs Reus23% tree cover · AQI 31Compare
- Castelló de la Plana vs Alicante8% tree cover · AQI 26Compare
- Castelló de la Plana vs Lleida22% tree cover · AQI 47Compare
- Castelló de la Plana vs Terrassa14% tree cover · AQI 64Compare
- Castelló de la Plana vs Barcelona13% tree cover · AQI 61Compare
Build your own
Compare Castelló de la Plana with somewhere else
This place
Castelló de la Plana
Want a different pair? Browse comparisons or measure any address.