Worst air pollution Barra Mansa, today and tomorrow
Today (20 September): Air quality in Barra Mansa is moderate. AQI and PM2.5 are moderate; PM10 and PM1 are fair; NO2, O3, SO2, CO, and HCHO are good. Pollution peaks around 10:00 AM (PM2.5: 42.9/100).
Tomorrow (21 September 2026): Air quality in Barra Mansa is moderate. PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 1:00 AM (PM2.5: 41.3/100). Airmine updates local air quality forecasts four times daily.
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Barra Mansa's air quality faces industrial challenges from the CSN and surrounding steel operations in the Paraíba do Sul valley shared with neighbouring Volta Redonda, with the broader Vale do Aço industrial corridor generating elevated PM10, SO₂, and heavy metals alongside vehicle traffic on the BR-393. The valley topography between the Serra da Mantiqueira and Serra do Mar creates topographic enclosure that concentrates industrial and vehicle emissions under calm conditions, making this steel valley one of Rio de Janeiro state's more challenging industrial air quality corridors.
Today - 20 September | Pollution peaks at 10:00
AQI:
Moderate
42.9/100
PM2.5 (fine particles):
Moderate
42.9/100
PM10 (coarse particles):
Fair
35.8/100
NO2 (nitrogen dioxide):
Good
0.2/100
O3 (ozone):
Good
15.5/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.3/100
HCHO (formaldehyde):
Good
0.5/100
PM1 (ultrafine particles):
Fair
22.6/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 01:00
AQI:
Moderate
41.3/100
PM2.5 (fine particles):
Moderate
41.3/100
PM10 (coarse particles):
Fair
29.1/100
NO2 (nitrogen dioxide):
Good
0.1/100
O3 (ozone):
Good
15.6/100
SO2 (sulfur dioxide):
Good
0.3/100
CO (carbon monoxide):
Good
0.3/100
HCHO (formaldehyde):
Good
0.5/100
PM1 (ultrafine particles):
Good
17.6/100
Pollen forecast in Barra Mansa
View pollen forecastFrequently Asked Questions
Is air quality bad in Barra Mansa right now?
On 20 September 2026, overall air quality in Barra Mansa is moderate. AQI is the main air quality indicator at 42.9/100. Pollution peaks around 10:00 AM (PM2.5: 42.9/100).
Will air quality be worse tomorrow in Barra Mansa?
On 21 September 2026, air quality conditions in Barra Mansa will be similar to today, with AQI forecast at moderate at 41.3/100. Pollution peaks around 1:00 AM (PM2.5: 41.3/100).
When is air pollution at its worst in Barra Mansa?
Air quality dips in Barra Mansa mostly track where native Atlantic Forest remnants and eucalyptus pollen peaks and periods of neighbouring Volta Redonda, with the broader Vale do Aço industrial corridor; the clearest air tends to follow a change in wind direction or rainfall here.
Are air quality levels in Barra Mansa 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 14:33 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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