Worst air pollution Mariana, today and tomorrow
Today (9 August): Air quality in Mariana is fair. AQI and PM2.5 are fair; PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (PM2.5: 37.7/100).
Tomorrow (10 August 2026): Air quality in Mariana is fair. AQI improves to medium; PM2.5 decreases to medium; PM10 increases to fair; all other pollutants stay as today. Pollution peaks around 2:00 PM (PM2.5: 42.2/100). Airmine updates local air quality forecasts four times daily.
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Mariana's air quality reflects the Gualaxo do Norte river valley in the Minas Gerais iron quadrilateral at 694 metres, with vehicle emissions from the MG-129 and the surrounding iron ore mining and processing operations — Mariana being the site of the catastrophic 2015 Fundão tailings dam collapse — generating elevated iron mineral PM10 and mining dust. The surrounding Espinhaço highlands create topographic variation, while the mining industry's pervasive influence dominates the local air quality profile throughout the year.
Today - 9 August | Pollution peaks at 14:00
AQI:
Fair
37.7/100
PM2.5 (fine particles):
Fair
37.7/100
PM10 (coarse particles):
Good
18.4/100
NO2 (nitrogen dioxide):
Good
0.2/100
O3 (ozone):
Good
18.9/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.4/100
PM1 (ultrafine particles):
Good
5.0/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 14:00
AQI:
Medium
42.2/100
PM2.5 (fine particles):
Medium
42.2/100
PM10 (coarse particles):
Fair
23.3/100
NO2 (nitrogen dioxide):
Good
0.3/100
O3 (ozone):
Good
19.0/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.4/100
PM1 (ultrafine particles):
Good
6.4/100
Pollen forecast in Mariana
View pollen forecastFrequently Asked Questions
Is air quality bad in Mariana right now?
On 9 August 2026, overall air quality in Mariana is fair. AQI is the main air quality indicator at 37.7/100. Pollution peaks around 2:00 PM (PM2.5: 37.7/100).
Will air quality be worse tomorrow in Mariana?
On 10 August 2026, air quality conditions in Mariana will be similar to today, with PM10 forecast at fair at 23.3/100. Pollution peaks around 2:00 PM (PM2.5: 42.2/100).
When is air pollution at its worst in Mariana?
People in Mariana tend to notice reduced air quality when native cerrado trees and eucalyptus pollen peaks, or because of vehicle emissions from the MG-129 and the surrounding iron ore mining and processing operations — Mariana; things typically settle down again once the weather pattern shifts.
Are air quality levels in Mariana 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: 9 August 2026 at 20:27 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.
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