Guarulhos corridor, São Paulo Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Guarulhos corridor is fair. AQI and PM10 are fair; PM2.5, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (PM10: 22.3/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Guarulhos corridor is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 7:00 PM (PM10: 24.2/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 22.3/100 |
| PM2.5 (fine particles) | Good | 18.3/100 |
| PM10 (coarse particles) | Fair | 22.3/100 |
| NO2 (nitrogen dioxide) | Good | 0.1/100 |
| O3 (ozone) | Good | 12.6/100 |
| SO2 (sulfur dioxide) | Good | 0.2/100 |
| CO (carbon monoxide) | Good | 0.3/100 |
| HCHO (formaldehyde) | Good | 0.5/100 |
| PM1 (ultrafine particles) | Good | 5.1/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 24.2/100 |
| PM2.5 (fine particles) | Fair | 20.6/100 |
| PM10 (coarse particles) | Fair | 24.2/100 |
| NO2 (nitrogen dioxide) | Good | 0.1/100 |
| O3 (ozone) | Good | 13.1/100 |
| SO2 (sulfur dioxide) | Good | 0.1/100 |
| CO (carbon monoxide) | Good | 0.3/100 |
| HCHO (formaldehyde) | Good | 0.5/100 |
| PM1 (ultrafine particles) | Good | 9.1/100 |
Local Environmental Conditions
With buildings covering much of the area around this part of São Paulo, traffic and other urban emissions are the biggest local influence on air quality. Lying in a basin at around 770 m, the area is prone to temperature inversions that hold pollutants near the ground when winds drop. Local sources include the airport and freight transport.
Warm, sunny weather from September to April, around 23°C at its peak, raises afternoon ozone levels. Even in the mild winter months, June to August, at around 17°C, calm nights let traffic pollution settle in the basin. October is usually the windiest month, averaging about 15 km/h, which helps keep the air clean.
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Frequently Asked Questions About Air Quality in São Paulo
Is air quality bad in Guarulhos corridor right now?
On 10 October 2026, overall air quality in Guarulhos corridor is fair. AQI is the main air quality indicator at 22.3/100. Pollution peaks around 11:00 AM (PM10: 22.3/100).
Will air quality be worse tomorrow in Guarulhos corridor?
On 11 October 2026, air quality conditions in Guarulhos corridor will be similar to today, with AQI forecast at fair at 24.2/100. Pollution peaks around 7:00 PM (PM10: 24.2/100).
When is air pollution at its worst in Guarulhos corridor?
Warm, sunny weather from September to April, around 23°C at its peak, raises afternoon ozone levels. Even in the mild winter months, June to August, at around 17°C, calm nights let traffic pollution settle in the basin. October is usually the windiest month, averaging about 15 km/h, which helps keep the air clean.
Are air quality levels in Guarulhos corridor 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. |