City report · Rio Grande do Sul, Brazil
Viamão Air quality today
Air quality in Viamão currently reads AQI 38 (Good): Air quality is satisfactory for everyone.
AQI 38
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.4
- tree cover
- 58.0%
- trees in this area
- 182K
- more trees needed
- 0
Measured across a 2 km radius around Centro, Viamão - RS, Brazil (12.57 km²), from a satellite image of Mar 4, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Viamão · AQI 38 (Good)
Viamão's tree count comes to 182,212 trees across 12.57 km², already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Viamão today: AQI 38, Good
Main pollutant: PM2.5 · Observed Nov 11, 05:00 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
6.4
PM10
7.3
NO₂
8.3
O₃
27.0
SO₂
2.8
CO
91.0
- 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 Viamão's daily AQI at 39 on average, from 24 on Nov 6 to an hourly peak of 60 on Nov 9.
Where Viamão stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Viamão: Healthy tree cover
58.0% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
182,212
Target trees
182,212
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Viamão lost?
Since 2001, the area within 10 km of Viamão has lost about 1,160 hectares of forest (about 1,600 football pitches): 8.9% of the forest it had in 2000. Most of it (63%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2018: satellite photo from March 2018 of a 5 × 5 km area about 7 km south of the city center.
- Forest lost since 2001
- 1,160 haabout 1,600 football pitches
- Share of its forest
- 8.9%of what there was in 2000
- Cleared for good
- 732 hadeforestation: turned into farms, mines or towns
Forest loss is speeding up: about 90 hectares a year in 2021–2025, up from 40 hectares a year in 2016–2020. The worst year was 2024, when about 121 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 | 27 ha | 9 ha | 36 ha |
| 2002 | 23 ha | 8 ha | 30 ha |
| 2003 | 12 ha | 11 ha | 24 ha |
| 2004 | 19 ha | 15 ha | 34 ha |
| 2005 | 28 ha | 18 ha | 46 ha |
| 2006 | 18 ha | 7 ha | 24 ha |
| 2007 | 26 ha | 32 ha | 58 ha |
| 2008 | 16 ha | 7 ha | 22 ha |
| 2009 | 18 ha | 3 ha | 21 ha |
| 2010 | 17 ha | 4 ha | 21 ha |
| 2011 | 13 ha | 4 ha | 17 ha |
| 2012 | 58 ha | 16 ha | 74 ha |
| 2013 | 29 ha | 8 ha | 37 ha |
| 2014 | 28 ha | 8 ha | 36 ha |
| 2015 | 27 ha | 12 ha | 39 ha |
| 2016 | 40 ha | 10 ha | 49 ha |
| 2017 | 25 ha | 15 ha | 39 ha |
| 2018 | 17 ha | 20 ha | 38 ha |
| 2019 | 29 ha | 11 ha | 40 ha |
| 2020 | 19 ha | 12 ha | 31 ha |
| 2021 | 80 ha | 17 ha | 97 ha |
| 2022 | 26 ha | 33 ha | 59 ha |
| 2023 | 47 ha | 40 ha | 87 ha |
| 2024 | 52 ha | 69 ha | 121 ha |
| 2025 | 40 ha | 45 ha | 85 ha |
What is causing deforestation around Viamão?
- Loggingcan grow back36% · 416 ha
- Farms, pasture and plantationscleared for good33% · 379 ha
- Towns and roadscleared for good30% · 353 ha
Also: 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
- 9,620 ha
- Forest in 2020
- 9,880 ha
- Overall change
- +259 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Viamão grew from about 9,620 hectares to 9,880 hectares, a net gain of about 259 hectares (+2.7%). New forest grew on about 818 hectares, while 558 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 Viamão
Same 2 km radius, same index — so they compare directly.
- Gravataí15.7 km
Brazil
- Tree cover
- 42%
- Air quality
- 42
- Porto Alegre20.6 km
Brazil
- Tree cover
- 22%
- Air quality
- 44
- Canoas23.8 km
Brazil
- Tree cover
- 20%
- Air quality
- 49
- São Leopoldo37.6 km
Brazil
- Tree cover
- 32%
- Air quality
- 26
- Novo Hamburgo46.0 km
Brazil
- Tree cover
- 31%
- Air quality
- 28
- Caxias do Sul102.6 km
Brazil
- Tree cover
- 18%
- Air quality
- 25
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Frequently asked
Questions about Viamão
What is the air quality (AQI) in Viamão right now?
The latest reading for Viamão shows an AQI of 38 (Good), observed Nov 11, 05:00 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 Viamão today?
At AQI 38 (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 Viamão been like this week?
Over the last 7 days, the CAMS air-quality model put Viamão's daily AQI at 39 on average, from 24 on Nov 6 to an hourly peak of 60 on Nov 9. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Viamão lost since 2001?
Since 2001, the area within 10 km of Viamão has lost about 1,160 hectares of forest (about 1,600 football pitches): 8.9% of the forest it had in 2000. Most of it (63%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Forest loss is speeding up: about 90 hectares a year in 2021–2025, up from 40 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Viamão grew from about 9,620 hectares to 9,880 hectares, a net gain of about 259 hectares (+2.7%). New forest grew on about 818 hectares, while 558 hectares were lost.
What is the tree count in Viamão?
Viamão has an estimated 182,212 trees across the 12.57 km² measured — 58.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Viamão need?
Viamão has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Viamão'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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