City report · Sergipe, Brazil
São Cristóvão Air quality today
Air quality in São Cristóvão currently reads AQI 37 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 37
Good
- PM2.5, fine particles (µg/m³)
- 7.3
- tree cover
- 50.3%
- trees in this area
- 153K
- more trees needed
- 0
Measured across a 2 km radius around Centro, São Cristóvão - SE, 49100-000, Brazil (12.57 km²), from a satellite image of Sep 18, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
São Cristóvão · AQI 37 (Good)
São Cristóvão's tree count comes to 153,439 trees across 12.21 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in São Cristóvão today: AQI 37, Good
Main pollutant: PM2.5 · Observed Nov 10, 16:00 local time via Open-Meteo / CAMS, US EPA index. Values in µg/m³.
Model estimate · no ground station nearby
Health signal
Air quality is satisfactory for everyone.
PM2.5
7.3
PM10
12.1
NO₂
0.9
O₃
42.0
SO₂
0.4
CO
118.0
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put São Cristóvão's daily AQI at 44 on average, from 32 on Nov 10 to an hourly peak of 55 on Nov 6.
Where São Cristóvão stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in São Cristóvão: Healthy tree cover
50.3% tree cover against a 30% healthy-neighborhood target, across 12.21 km² of land.
Trees in this area
153,439
Target trees
153,439
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has São Cristóvão lost?
Since 2001, the area within 10 km of São Cristóvão has lost about 1,200 hectares of forest (about 1,700 football pitches): 11% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2019: satellite photo from October 2019 of a 5 × 5 km area about 4 km east of the city center.
- Forest lost since 2001
- 1,200 haabout 1,700 football pitches
- Share of its forest
- 11%of what there was in 2000
- Cleared for good
- 1,040 hadeforestation: turned into farms, mines or towns
Forest loss is slowing down: about 24 hectares a year in 2021–2025, down from 81 hectares a year in 2016–2020. The worst year was 2017, when about 209 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 | 69 ha | under 1 ha | 70 ha |
| 2002 | 44 ha | under 1 ha | 45 ha |
| 2003 | 35 ha | under 1 ha | 36 ha |
| 2004 | 17 ha | 2 ha | 19 ha |
| 2005 | 57 ha | 3 ha | 60 ha |
| 2006 | 107 ha | 4 ha | 111 ha |
| 2007 | 85 ha | 2 ha | 87 ha |
| 2008 | 62 ha | 3 ha | 65 ha |
| 2009 | 42 ha | under 1 ha | 42 ha |
| 2010 | 41 ha | 4 ha | 45 ha |
| 2011 | 9 ha | 3 ha | 12 ha |
| 2012 | 31 ha | 2 ha | 33 ha |
| 2013 | 20 ha | 4 ha | 24 ha |
| 2014 | 16 ha | under 1 ha | 16 ha |
| 2015 | 6 ha | under 1 ha | 6 ha |
| 2016 | 27 ha | under 1 ha | 27 ha |
| 2017 | 134 ha | 75 ha | 209 ha |
| 2018 | 33 ha | 9 ha | 41 ha |
| 2019 | 47 ha | 13 ha | 60 ha |
| 2020 | 43 ha | 27 ha | 69 ha |
| 2021 | 37 ha | under 1 ha | 37 ha |
| 2022 | 44 ha | 3 ha | 48 ha |
| 2023 | 18 ha | under 1 ha | 18 ha |
| 2024 | 9 ha | under 1 ha | 9 ha |
| 2025 | 10 ha | under 1 ha | 11 ha |
What is causing deforestation around São Cristóvão?
- Farms, pasture and plantationscleared for good80% · 953 ha
- Mining and energycleared for good5.9% · 71 ha
- Wildfirescan grow back4.8% · 57 ha
Also: storms, floods and other natural causes, logging, towns and roads, 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
- 8,120 ha
- Forest in 2020
- 8,350 ha
- Overall change
- +230 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around São Cristóvão grew from about 8,120 hectares to 8,350 hectares, a net gain of about 230 hectares (+2.8%). New forest grew on about 481 hectares, while 251 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 São Cristóvão
Same 2 km radius, same index — so they compare directly.
- Aracaju18.7 km
Brazil
- Tree cover
- 9%
- Air quality
- 29
- Nossa Senhora do Socorro19.8 km
Brazil
- Tree cover
- 28%
- Air quality
- 37
- Itabaiana43.8 km
Brazil
- Tree cover
- 10%
- Air quality
- 29
- Lagarto49.6 km
Brazil
- Tree cover
- 23%
- Air quality
- 29
- Arapiraca152.5 km
Brazil
- Tree cover
- 10%
- Air quality
- 55
- Alagoinhas181.6 km
Brazil
- Tree cover
- 17%
- Air quality
- 28
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Frequently asked
Questions about São Cristóvão
What is the air quality (AQI) in São Cristóvão right now?
The latest reading for São Cristóvão shows an AQI of 37 (Good), observed Nov 10, 16:00 local time via Open-Meteo / CAMS, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in São Cristóvão today?
At AQI 37 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in São Cristóvão been like this week?
Over the last 7 days, the CAMS air-quality model put São Cristóvão's daily AQI at 44 on average, from 32 on Nov 10 to an hourly peak of 55 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around São Cristóvão lost since 2001?
Since 2001, the area within 10 km of São Cristóvão has lost about 1,200 hectares of forest (about 1,700 football pitches): 11% of the forest it had in 2000. Most of it (87%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Forest loss is slowing down: about 24 hectares a year in 2021–2025, down from 81 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around São Cristóvão grew from about 8,120 hectares to 8,350 hectares, a net gain of about 230 hectares (+2.8%). New forest grew on about 481 hectares, while 251 hectares were lost.
What is the tree count in São Cristóvão?
São Cristóvão has an estimated 153,439 trees across the 12.21 km² of land measured — 50.3% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does São Cristóvão need?
São Cristóvão has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are São Cristóvão'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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