Worst air pollution Três Rios, today and tomorrow
Today (16 July): Air quality in Três Rios is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 PM (O3: 16.1/100).
Tomorrow (17 July 2026): Air quality in Três Rios is good. All pollutants stay as today. Pollution peaks around 6:00 PM (O3: 17.0/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Três Rios' air quality reflects the Paraíba do Sul river valley in the Rio de Janeiro interior at the confluence of three rivers, with vehicle emissions from the BR-393 and surrounding industrial and commercial operations contributing local sources. The valley's topographic enclosure between surrounding highland ridges creates concentration under calm conditions, while Atlantic sea breezes from the nearby coast provide periodic ventilation relief throughout the year.
Today - 16 July | Pollution peaks at 19:00
AQI:
Good
16.1/100
PM2.5 (fine particles):
Good
8.1/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Good
16.1/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.4/100
PM1 (ultrafine particles):
Good
1.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 18:00
AQI:
Good
17.0/100
PM2.5 (fine particles):
Good
8.1/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Good
17.0/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.4/100
PM1 (ultrafine particles):
Good
1.9/100
Pollen forecast in Três Rios
View pollen forecastFrequently Asked Questions
Is air quality bad in Três Rios right now?
On 16 July 2026, overall air quality in Três Rios is good. AQI is the main air quality indicator at 16.1/100. Pollution peaks around 7:00 PM (O3: 16.1/100).
Will air quality be worse tomorrow in Três Rios?
On 17 July 2026, air quality conditions in Três Rios will be similar to today, with AQI forecast at good at 17.0/100. Pollution peaks around 6:00 PM (O3: 17.0/100).
When is air pollution at its worst in Três Rios?
The most noticeable dips in Três Rios's air quality come when native Atlantic Forest remnants and eucalyptus pollen peaks, or because of vehicle emissions from the BR-393 and surrounding industrial and commercial operations; cooler, breezier weather later in the year tends to bring things back down.
Are air quality levels in Três Rios based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app