City report · Rio Grande do Sul, Brazil
Caxias do Sul Air quality today
Air quality in Caxias do Sul currently reads AQI 18 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 18
Good
- PM2.5, fine particles (µg/m³)
- 3.2
- tree cover
- 17.7%
- trees in this area
- 55.6K
- more trees needed
- 38.6K
Measured across a 2 km radius around Centro, Caxias do Sul - RS, Brazil (12.57 km²), from a satellite image of Oct 27, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Caxias do Sul · AQI 18 (Good)
Caxias do Sul's tree count comes to 55,606 trees across 12.57 km², 12 points below the 30% tree-cover level considered healthy for this area, so roughly 38,642 more trees would close the gap.
Air quality detail
Air quality in Caxias do Sul today: AQI 18, Good
Main pollutant: PM2.5 · Observed Nov 11, 12:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Caxias do Sul, 1.1 km away
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.2
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, gmorais
- 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 Caxias do Sul's daily AQI at 27 on average, from 14 on Nov 11 to an hourly peak of 56 on Nov 6.
Where Caxias do Sul stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Caxias do Sul: Critically low
17.7% tree cover against a 30% healthy-neighborhood target, across 12.57 km².
Trees in this area
55,606
Target trees
94,248
More trees needed
38,642
CO₂ if planted / yr
850.1 t
Deforestation · 2001–2025
How much forest has Caxias do Sul lost?
Since 2001, the area within 10 km of Caxias do Sul has lost about 2,140 hectares of forest (about 3,000 football pitches): 11% of the forest it had in 2000. Most of it (88%) 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 west of the city center.
- Forest lost since 2001
- 2,140 haabout 3,000 football pitches
- Share of its forest
- 11%of what there was in 2000
- Cleared for good
- 1,870 hadeforestation: turned into farms, mines or towns
Forest loss has stayed about the same: about 85 hectares a year in 2021–2025, against 98 hectares a year in 2016–2020. The worst year was 2017, when about 159 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 | 74 ha | 6 ha | 80 ha |
| 2002 | 38 ha | 7 ha | 45 ha |
| 2003 | 89 ha | 20 ha | 109 ha |
| 2004 | 98 ha | 4 ha | 102 ha |
| 2005 | 75 ha | 5 ha | 79 ha |
| 2006 | 47 ha | 12 ha | 59 ha |
| 2007 | 64 ha | 10 ha | 74 ha |
| 2008 | 68 ha | 20 ha | 87 ha |
| 2009 | 61 ha | 20 ha | 81 ha |
| 2010 | 58 ha | 7 ha | 65 ha |
| 2011 | 33 ha | 5 ha | 39 ha |
| 2012 | 135 ha | 7 ha | 142 ha |
| 2013 | 53 ha | 3 ha | 55 ha |
| 2014 | 112 ha | 13 ha | 125 ha |
| 2015 | 74 ha | 7 ha | 82 ha |
| 2016 | 146 ha | 7 ha | 153 ha |
| 2017 | 150 ha | 9 ha | 159 ha |
| 2018 | 59 ha | 1 ha | 60 ha |
| 2019 | 35 ha | 6 ha | 41 ha |
| 2020 | 65 ha | 9 ha | 74 ha |
| 2021 | 72 ha | 12 ha | 84 ha |
| 2022 | 48 ha | 26 ha | 74 ha |
| 2023 | 51 ha | 17 ha | 68 ha |
| 2024 | 88 ha | 22 ha | 110 ha |
| 2025 | 78 ha | 13 ha | 91 ha |
What is causing deforestation around Caxias do Sul?
- Towns and roadscleared for good52% · 1,110 ha
- Farms, pasture and plantationscleared for good35% · 747 ha
- Loggingcan grow back12% · 251 ha
Also: mining and energy, 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
- 20,300 ha
- Forest in 2020
- 19,200 ha
- Overall change
- −1,100 haless forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Caxias do Sul shrank from about 20,300 hectares to 19,200 hectares, a net loss of about 1,100 hectares (−5.4%). New forest grew on about 207 hectares, but 1,300 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 Caxias do Sul
Same 2 km radius, same index — so they compare directly.
- Bento Gonçalves33.0 km
Brazil
- Tree cover
- 40%
- Air quality
- 12
- Novo Hamburgo56.9 km
Brazil
- Tree cover
- 31%
- Air quality
- 28
- São Leopoldo65.9 km
Brazil
- Tree cover
- 32%
- Air quality
- 26
- Canoas83.4 km
Brazil
- Tree cover
- 20%
- Air quality
- 49
- Gravataí87.9 km
Brazil
- Tree cover
- 42%
- Air quality
- 42
- Alvorada93.1 km
Brazil
- Tree cover
- 22%
- Air quality
- 56
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Frequently asked
Questions about Caxias do Sul
What is the air quality (AQI) in Caxias do Sul right now?
The latest reading for Caxias do Sul shows an AQI of 18 (Good), measured Nov 11, 12:00 local time by the Caxias do Sul ground monitoring station, 1.1 km away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Caxias do Sul today?
At AQI 18 (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 Caxias do Sul been like this week?
Over the last 7 days, the CAMS air-quality model put Caxias do Sul's daily AQI at 27 on average, from 14 on Nov 11 to an hourly peak of 56 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 Caxias do Sul lost since 2001?
Since 2001, the area within 10 km of Caxias do Sul has lost about 2,140 hectares of forest (about 3,000 football pitches): 11% of the forest it had in 2000. Most of it (88%) was deforestation, forest cleared for good, mainly for towns and roads. Forest loss has stayed about the same: about 85 hectares a year in 2021–2025, against 98 hectares a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Caxias do Sul shrank from about 20,300 hectares to 19,200 hectares, a net loss of about 1,100 hectares (−5.4%). New forest grew on about 207 hectares, but 1,300 hectares were lost.
What is the tree count in Caxias do Sul?
Caxias do Sul has an estimated 55,606 trees across the 12.57 km² measured — 17.7% tree cover, 12 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Caxias do Sul need?
Caxias do Sul needs roughly 38,642 more trees to close a 12-point shortfall against its 30% tree-cover target — about 850.1 t of extra CO₂ absorbed per year once grown.
How are Caxias do Sul's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Centro, 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 Centro; the tree count is an estimate derived from that cover.
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