City report · Pará, Brazil
Castanhal Air quality today
Air quality in Castanhal currently reads AQI 52 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 52
Moderate
- PM2.5, fine particles (µg/m³)
- 10.3
- tree cover
- 9.6%
- trees in this area
- 30.2K
- more trees needed
- 64.1K
Measured across a 2 km radius around Centro, Castanhal - PA, Brazil (12.57 km²), from a satellite image of Oct 31, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Castanhal · AQI 52 (Moderate)
Castanhal's tree count comes to 30,159 trees across 12.57 km², 20 points below the 30% tree-cover level considered healthy for this area, so roughly 64,088 more trees would close the gap.
Air quality detail
Air quality in Castanhal today: AQI 52, Moderate
Main pollutant: PM2.5 · Observed Nov 10, 21:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
10.3
PM10
12.2
NO₂
8.0
O₃
20.0
SO₂
1.3
CO
131.0
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Castanhal's daily AQI at 40 on average, from 28 on Nov 4 to an hourly peak of 57 on Nov 8.
Where Castanhal stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Castanhal: Critically low
9.6% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
30,159
Target trees
94,247
More trees needed
64,088
CO₂ if planted / yr
1,410 t
Deforestation · 2001–2025
How much forest has Castanhal lost?
Since 2001, the area within 10 km of Castanhal has lost about 7,730 hectares of forest (about 11,000 football pitches): 39% of the forest it had in 2000. Most of it (97%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km south of the city center.
- Forest lost since 2001
- 7,730 haabout 11,000 football pitches
- Share of its forest
- 39%of what there was in 2000
- Cleared for good
- 7,500 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 217 hectares a year in 2021–2025, down from 360 hectares a year in 2016–2020. The worst year was 2018, when about 591 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 379 ha | 10 ha | 389 ha |
| 2002 | 189 ha | under 1 ha | 189 ha |
| 2003 | 342 ha | 5 ha | 347 ha |
| 2004 | 282 ha | 2 ha | 284 ha |
| 2005 | 285 ha | 2 ha | 287 ha |
| 2006 | 349 ha | under 1 ha | 349 ha |
| 2007 | 384 ha | 1 ha | 385 ha |
| 2008 | 344 ha | 1 ha | 345 ha |
| 2009 | 269 ha | 7 ha | 276 ha |
| 2010 | 242 ha | 15 ha | 257 ha |
| 2011 | 349 ha | 38 ha | 387 ha |
| 2012 | 108 ha | 3 ha | 111 ha |
| 2013 | 385 ha | 10 ha | 395 ha |
| 2014 | 401 ha | 2 ha | 403 ha |
| 2015 | 447 ha | 1 ha | 448 ha |
| 2016 | 333 ha | 7 ha | 340 ha |
| 2017 | 348 ha | 4 ha | 352 ha |
| 2018 | 480 ha | 111 ha | 591 ha |
| 2019 | 246 ha | 11 ha | 257 ha |
| 2020 | 258 ha | under 1 ha | 258 ha |
| 2021 | 129 ha | 1 ha | 130 ha |
| 2022 | 224 ha | 1 ha | 225 ha |
| 2023 | 261 ha | 2 ha | 263 ha |
| 2024 | 261 ha | 2 ha | 263 ha |
| 2025 | 203 ha | under 1 ha | 203 ha |
What is causing deforestation around Castanhal?
- Farms, pasture and plantationscleared for good88% · 6,810 ha
- Towns and roadscleared for good7.2% · 557 ha
- Shifting farmingcan grow back1.8% · 140 ha
Also: mining and energy, logging, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 9,980 ha
- Forest in 2020
- 8,580 ha
- Overall change
- −1,410 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Castanhal shrank from about 9,980 hectares to 8,580 hectares, a net loss of about 1,410 hectares (−14%). New forest grew on about 793 hectares, but 2,200 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
In the same region
Measured cities near Castanhal
Same 2 km radius, same index — so they compare directly.
- Ananindeua50.2 km
Brazil
- Tree cover
- 27%
- Air quality
- 61
- Belém66.7 km
Brazil
- Tree cover
- 8%
- Air quality
- 52
- Barcarena81.2 km
Brazil
- Tree cover
- 64%
- Air quality
- 44
- Abaetetuba116.3 km
Brazil
- Tree cover
- 43%
- Air quality
- 52
- Bragança131.8 km
Brazil
- Tree cover
- 41%
- Air quality
- 34
- Paragominas199.6 km
Brazil
- Tree cover
- 10%
- Air quality
- 59
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Frequently asked
Questions about Castanhal
What is the air quality (AQI) in Castanhal right now?
The latest reading for Castanhal shows an AQI of 52 (Moderate), observed Nov 10, 21:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Castanhal today?
At AQI 52 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Castanhal been like this week?
Over the last 7 days, the CAMS air-quality model put Castanhal's daily AQI at 40 on average, from 28 on Nov 4 to an hourly peak of 57 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Castanhal lost since 2001?
Since 2001, the area within 10 km of Castanhal has lost about 7,730 hectares of forest (about 11,000 football pitches): 39% of the forest it had in 2000. Most of it (97%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Forest loss is slowing down: about 217 hectares a year in 2021–2025, down from 360 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Castanhal shrank from about 9,980 hectares to 8,580 hectares, a net loss of about 1,410 hectares (−14%). New forest grew on about 793 hectares, but 2,200 hectares were lost.
What is the tree count in Castanhal?
Castanhal has an estimated 30,159 trees across the 12.57 km² measured — 9.6% tree cover, 20 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Castanhal need?
Castanhal needs roughly 64,088 more trees to close a 20-point shortfall against its 30% tree-cover target — about 1,410 t of extra CO₂ absorbed per year once grown.
How are Castanhal's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Centro; the tree count is an estimate derived from that cover.
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