City report · Rio de Janeiro, Brazil
Niterói Air quality today
Air quality in Niterói currently reads AQI 20 (Good): Air quality is satisfactory for everyone.
AQI 20
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 3.6
- tree cover
- 33.0%
- trees in this area
- 100K
- more trees needed
- 0
Measured across a 2 km radius around São Lourenço, Niterói - RJ, Brazil (12.57 km²), from a satellite image of Oct 24, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Niterói · AQI 20 (Good)
Niterói's tree count comes to 100,459 trees across 12.18 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Niterói today: AQI 20, Good
Main pollutant: PM2.5 · Observed Nov 11, 13:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Praça XV, 7.4 km away · median of 5 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.6
PM10
8.0
NO₂
—
O₃
—
SO₂
—
CO
916.5
Data: OpenAQ · Rio City Hall, Prefeitura da Cidade do Rio de Janeiro · MonitorAr-Rio
- 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 Niterói's daily AQI at 76 on average, from 59 on Nov 7 to an hourly peak of 167 on Nov 4.
Where Niterói stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Niterói: Healthy tree cover
33.0% tree cover against a 30% healthy-neighborhood target, across 12.18 km² of land.
Trees in this area
100,459
Target trees
100,459
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Niterói lost?
Since 2001, the area within 10 km of Niterói has lost about 195 hectares of forest (about 270 football pitches): 3.1% of the forest it had in 2000. Most of it (77%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area about 6 km east of the city center.
- Forest lost since 2001
- 195 haabout 270 football pitches
- Share of its forest
- 3.1%of what there was in 2000
- Cleared for good
- 149 hadeforestation: turned into farms, mines or towns
The worst year was 2017, when about 50 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 | 8 ha | under 1 ha | 9 ha |
| 2002 | 2 ha | under 1 ha | 2 ha |
| 2003 | under 1 ha | under 1 ha | 1 ha |
| 2004 | 4 ha | under 1 ha | 5 ha |
| 2005 | 1 ha | under 1 ha | 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | 14 ha | 2 ha | 15 ha |
| 2008 | 5 ha | under 1 ha | 5 ha |
| 2009 | 1 ha | under 1 ha | 1 ha |
| 2010 | 3 ha | under 1 ha | 3 ha |
| 2011 | 9 ha | under 1 ha | 9 ha |
| 2012 | 11 ha | 3 ha | 13 ha |
| 2013 | 3 ha | under 1 ha | 3 ha |
| 2014 | 15 ha | 3 ha | 18 ha |
| 2015 | 16 ha | 1 ha | 17 ha |
| 2016 | 3 ha | 2 ha | 5 ha |
| 2017 | 25 ha | 25 ha | 50 ha |
| 2018 | 7 ha | under 1 ha | 7 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | 2 ha | under 1 ha | 2 ha |
| 2021 | 3 ha | under 1 ha | 3 ha |
| 2022 | 3 ha | under 1 ha | 4 ha |
| 2023 | 1 ha | under 1 ha | 1 ha |
| 2024 | 4 ha | under 1 ha | 4 ha |
| 2025 | 9 ha | 6 ha | 15 ha |
What is causing deforestation around Niterói?
- Towns and roadscleared for good67% · 130 ha
- Wildfirescan grow back11% · 22 ha
- Farms, pasture and plantationscleared for good9.7% · 19 ha
Also: 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
- 6,250 ha
- Forest in 2020
- 6,250 ha
- Overall change
- +4 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Niterói stayed about the same size, at about 6,250 hectares: new forest grew on about 98 hectares, and about 94 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 Niterói
Same 2 km radius, same index — so they compare directly.
- Duque de Caxias23.9 km
Brazil
- Tree cover
- 17%
- Air quality
- 126
- Magé26.4 km
Brazil
- Tree cover
- 62%
- Air quality
- 25
- Itaboraí29.4 km
Brazil
- Tree cover
- 45%
- Air quality
- 12
- Maricá29.5 km
Brazil
- Tree cover
- 48%
- Air quality
- 14
- Barra da Tijuca29.7 km
Brazil
- Tree cover
- 41%
- Air quality
- 14
- Nova Iguaçu38.2 km
Brazil
- Tree cover
- 33%
- Air quality
- 77
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Frequently asked
Questions about Niterói
What is the air quality (AQI) in Niterói right now?
The latest reading for Niterói shows an AQI of 20 (Good), measured Nov 11, 13:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Praça XV, 7.4 km away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Niterói today?
At AQI 20 (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 Niterói been like this week?
Over the last 7 days, the CAMS air-quality model put Niterói's daily AQI at 76 on average, from 59 on Nov 7 to an hourly peak of 167 on Nov 4. On 1 of those days the average was above 100, unhealthy for sensitive groups.
How much forest has the area around Niterói lost since 2001?
Since 2001, the area within 10 km of Niterói has lost about 195 hectares of forest (about 270 football pitches): 3.1% of the forest it had in 2000. Most of it (77%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Niterói stayed about the same size, at about 6,250 hectares: new forest grew on about 98 hectares, and about 94 hectares were lost.
What is the tree count in Niterói?
Niterói has an estimated 100,459 trees across the 12.18 km² of land measured — 33.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Niterói need?
Niterói has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Niterói's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near São Lourenço, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. 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 São Lourenço; the tree count is an estimate derived from that cover.
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