São João del Rei Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in São João del Rei is fair. AQI, PM2.5, and PM10 are fair; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM2.5: 38.6/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in São João del Rei is fair. All pollutants stay as today. Pollution peaks around 11:00 AM (PM2.5: 32.8/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 38.6/100 |
| PM2.5 (fine particles) | Fair | 38.6/100 |
| PM10 (coarse particles) | Fair | 25.7/100 |
| NO2 (nitrogen dioxide) | Good | 0.2/100 |
| O3 (ozone) | Good | 12.7/100 |
| SO2 (sulfur dioxide) | Good | 0.2/100 |
| CO (carbon monoxide) | Good | 0.3/100 |
| HCHO (formaldehyde) | Good | 0.5/100 |
| PM1 (ultrafine particles) | Good | 5.8/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 32.8/100 |
| PM2.5 (fine particles) | Fair | 32.8/100 |
| PM10 (coarse particles) | Fair | 22.4/100 |
| NO2 (nitrogen dioxide) | Good | 0.2/100 |
| O3 (ozone) | Good | 11.9/100 |
| SO2 (sulfur dioxide) | Good | 0.2/100 |
| CO (carbon monoxide) | Good | 0.3/100 |
| HCHO (formaldehyde) | Good | 0.5/100 |
| PM1 (ultrafine particles) | Good | 5.5/100 |
Local Environmental Conditions
Around the center of São João del Rei, dense development means road traffic is the main local source of nitrogen dioxide and fine particles. At around 910 m above sea level, the air is generally well mixed, though calm, cold nights can trap smoke near the ground. Manufacturing adds to local emissions. Parks and street trees provide a modest buffer against traffic pollution.
Warm, sunny weather from September to April, around 22°C at its peak, raises afternoon ozone levels. Later, air near roads is often at its worst from May to July, when nights cool to around 18°C and the air turns still. From May to August, dry weather raises the risk of wildfires, and their smoke can cover the area in haze.
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Frequently Asked Questions About Air Quality in Minas Gerais
Is air quality bad in São João del Rei right now?
On 10 October 2026, overall air quality in São João del Rei is fair. AQI is the main air quality indicator at 38.6/100. Pollution peaks around 10:00 AM (PM2.5: 38.6/100).
Will air quality be worse tomorrow in São João del Rei?
On 11 October 2026, air quality conditions in São João del Rei will be similar to today, with AQI forecast at fair at 32.8/100. Pollution peaks around 11:00 AM (PM2.5: 32.8/100).
When is air pollution at its worst in São João del Rei?
Warm, sunny weather from September to April, around 22°C at its peak, raises afternoon ozone levels. Later, air near roads is often at its worst from May to July, when nights cool to around 18°C and the air turns still. From May to August, dry weather raises the risk of wildfires, and their smoke can cover the area in haze.
Are air quality levels in São João del Rei 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.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |