City report · Rio Grande do Sul, Brazil
Porto Alegre Air quality today
Air quality in Porto Alegre currently reads AQI 44 (Good): Air quality is satisfactory for everyone.
AQI 44
Air quality right now
Good
- PM2.5, fine particles (µg/m³)
- 6.9
- tree cover
- 22.0%
- trees in this area
- 43.3K
- more trees needed
- 15.7K
Measured across a 2 km radius around Historical Centre, Porto Alegre - RS, Brazil (12.57 km²), from a satellite image of Mar 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Porto Alegre · AQI 44 (Good)
Porto Alegre's tree count comes to 43,266 trees across 7.87 km² of land, 8 points below the 30% tree-cover level considered healthy for this area, so roughly 15,733 more trees would close the gap.
Air quality detail
Air quality in Porto Alegre today: AQI 44, Good
Main pollutant: PM2.5 · Observed Nov 11, 03:00 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
6.9
PM10
8.4
NO₂
7.0
O₃
32.0
SO₂
2.8
CO
115.0
- 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 Porto Alegre's daily AQI at 40 on average, from 24 on Nov 6 to an hourly peak of 60 on Nov 9.
Where Porto Alegre stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Porto Alegre: Below target
22.0% tree cover against a 30% healthy-neighborhood target, across 7.87 km² of land.
Trees in this area
43,266
Target trees
58,999
More trees needed
15,733
CO₂ if planted / yr
346.1 t
Deforestation · 2001–2025
How much forest has Porto Alegre lost?
Since 2001, the area within 10 km of Porto Alegre has lost about 196 hectares of forest (about 270 football pitches): 3.6% of the forest it had in 2000. Most of it (85%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from January 2017 of a 5 × 5 km area about 7 km east of the city center.
- Forest lost since 2001
- 196 haabout 270 football pitches
- Share of its forest
- 3.6%of what there was in 2000
- Cleared for good
- 166 hadeforestation: turned into farms, mines or towns
The worst year was 2021, when about 14 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 | 2 ha | under 1 ha | 2 ha |
| 2002 | 6 ha | 2 ha | 8 ha |
| 2003 | 3 ha | under 1 ha | 4 ha |
| 2004 | 9 ha | under 1 ha | 10 ha |
| 2005 | 11 ha | under 1 ha | 12 ha |
| 2006 | 7 ha | under 1 ha | 7 ha |
| 2007 | 7 ha | 2 ha | 9 ha |
| 2008 | 3 ha | 1 ha | 4 ha |
| 2009 | 9 ha | under 1 ha | 9 ha |
| 2010 | 11 ha | 3 ha | 14 ha |
| 2011 | 3 ha | under 1 ha | 3 ha |
| 2012 | 13 ha | 1 ha | 14 ha |
| 2013 | 6 ha | 1 ha | 7 ha |
| 2014 | 5 ha | 2 ha | 6 ha |
| 2015 | 4 ha | under 1 ha | 4 ha |
| 2016 | 5 ha | 2 ha | 7 ha |
| 2017 | 12 ha | under 1 ha | 13 ha |
| 2018 | 3 ha | under 1 ha | 3 ha |
| 2019 | 2 ha | under 1 ha | 2 ha |
| 2020 | 9 ha | under 1 ha | 9 ha |
| 2021 | 14 ha | under 1 ha | 14 ha |
| 2022 | 11 ha | 4 ha | 14 ha |
| 2023 | 4 ha | under 1 ha | 4 ha |
| 2024 | 6 ha | 7 ha | 13 ha |
| 2025 | 2 ha | 2 ha | 4 ha |
What is causing deforestation around Porto Alegre?
- Towns and roadscleared for good67% · 132 ha
- Farms, pasture and plantationscleared for good10% · 21 ha
- Mining and energycleared for good7.2% · 14 ha
Also: logging, storms, floods and other natural causes, 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
- 4,200 ha
- Forest in 2020
- 4,210 ha
- Overall change
- +12 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Porto Alegre stayed about the same size, at about 4,210 hectares: new forest grew on about 197 hectares, and about 185 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 Porto Alegre
Same 2 km radius, same index — so they compare directly.
- Canoas13.6 km
Brazil
- Tree cover
- 20%
- Air quality
- 49
- Alvorada15.3 km
Brazil
- Tree cover
- 22%
- Air quality
- 56
- Viamão20.6 km
Brazil
- Tree cover
- 58%
- Air quality
- 38
- Gravataí25.0 km
Brazil
- Tree cover
- 42%
- Air quality
- 42
- São Leopoldo31.3 km
Brazil
- Tree cover
- 32%
- Air quality
- 26
- Novo Hamburgo40.6 km
Brazil
- Tree cover
- 31%
- Air quality
- 28
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Frequently asked
Questions about Porto Alegre
What is the air quality (AQI) in Porto Alegre right now?
The latest reading for Porto Alegre shows an AQI of 44 (Good), observed Nov 11, 03:00 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 Porto Alegre today?
At AQI 44 (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 Porto Alegre been like this week?
Over the last 7 days, the CAMS air-quality model put Porto Alegre's daily AQI at 40 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 Porto Alegre lost since 2001?
Since 2001, the area within 10 km of Porto Alegre has lost about 196 hectares of forest (about 270 football pitches): 3.6% of the forest it had in 2000. Most of it (85%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Porto Alegre stayed about the same size, at about 4,210 hectares: new forest grew on about 197 hectares, and about 185 hectares were lost.
What is the tree count in Porto Alegre?
Porto Alegre has an estimated 43,266 trees across the 7.87 km² of land measured — 22.0% tree cover, 8 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Porto Alegre need?
Porto Alegre needs roughly 15,733 more trees to close a 8-point shortfall against its 30% tree-cover target — about 346.1 t of extra CO₂ absorbed per year once grown.
How are Porto Alegre'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 Historical Centre; the tree count is an estimate derived from that cover.
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