Cotia Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Cotia 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 Cotia 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 | 19.2/100 |
| PM10 (coarse particles) | Fair | 22.3/100 |
| NO2 (nitrogen dioxide) | Good | 0.1/100 |
| O3 (ozone) | Good | 12.4/100 |
| 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 | 21.6/100 |
| PM10 (coarse particles) | Fair | 24.2/100 |
| NO2 (nitrogen dioxide) | Good | 0.1/100 |
| O3 (ozone) | Good | 12.9/100 |
| SO2 (sulfur dioxide) | Good | 0.1/100 |
| CO (carbon monoxide) | Good | 0.3/100 |
| HCHO (formaldehyde) | Good | 0.5/100 |
| PM1 (ultrafine particles) | Good | 9.0/100 |
Local Environmental Conditions
The center of Cotia is largely built up, so vehicle exhaust and urban activity dominate the local air pollution sources. Lying in a basin at around 800 m, the area is prone to temperature inversions that hold pollutants near the ground when winds drop. Freight transport adds to local emissions. Pockets of trees and green space help filter a small share of the particles from traffic.
From September to April, strong sunshine and temperatures around 23°C drive ozone formation, with levels peaking in the afternoon. From June to August, cooler, still nights at around 16°C allow pollution to collect in the basin. Wildfire smoke is most likely from May to August, sometimes turning the sky hazy for days.
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Frequently Asked Questions About Air Quality in São Paulo
Is air quality bad in Cotia right now?
On 10 October 2026, overall air quality in Cotia 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 Cotia?
On 11 October 2026, air quality conditions in Cotia 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 Cotia?
From September to April, strong sunshine and temperatures around 23°C drive ozone formation, with levels peaking in the afternoon. From June to August, cooler, still nights at around 16°C allow pollution to collect in the basin. Wildfire smoke is most likely from May to August, sometimes turning the sky hazy for days.
Are air quality levels in Cotia 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. |