Sesto San Giovanni Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (11 October): Air quality in Sesto San Giovanni is poor. AQI and PM1 are poor; PM2.5, PM10, and NO2 are moderate; O3 and HCHO are fair; SO2 and CO are good. Pollution peaks around 10:00 PM (PM1: 63.8/100).
Air Quality Tomorrow
Tomorrow (12 October 2026): Air quality in Sesto San Giovanni is poor. O3 decreases to good; HCHO decreases to good; all other pollutants stay as today. Pollution peaks around 12:00 AM (PM1: 61.9/100).
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Air Quality
Today - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Poor | 63.8/100 |
| PM2.5 (fine particles) | Moderate | 45.7/100 |
| PM10 (coarse particles) | Moderate | 42.6/100 |
| NO2 (nitrogen dioxide) | Moderate | 52.8/100 |
| O3 (ozone) | Fair | 27.0/100 |
| SO2 (sulfur dioxide) | Good | 3.6/100 |
| CO (carbon monoxide) | Good | 1.6/100 |
| HCHO (formaldehyde) | Fair | 20.6/100 |
| PM1 (ultrafine particles) | Poor | 63.8/100 |
Tomorrow - 12 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Poor | 61.9/100 |
| PM2.5 (fine particles) | Moderate | 45.7/100 |
| PM10 (coarse particles) | Moderate | 41.9/100 |
| NO2 (nitrogen dioxide) | Moderate | 51.2/100 |
| O3 (ozone) | Good | 17.1/100 |
| SO2 (sulfur dioxide) | Good | 2.3/100 |
| CO (carbon monoxide) | Good | 1.4/100 |
| HCHO (formaldehyde) | Good | 18.4/100 |
| PM1 (ultrafine particles) | Poor | 61.9/100 |
Local Environmental Conditions
Around the center of Sesto San Giovanni, dense development means road traffic is the main local source of nitrogen dioxide and fine particles. Lying in the Po Valley, the area is prone to temperature inversions that hold pollutants near the ground when winds drop. Local sources include steelmaking. Home heating, especially wood stoves and fireplaces, adds smoke and fine particles in the colder months.
The colder months, December to February, bring the most frequent inversions, when emissions from home heating and traffic are held close to the ground at around 4°C. In the warmer months, warm, sunny weather from June to September, around 25°C at its peak, raises afternoon ozone levels. Short-term changes follow the weather: calm spells raise levels, while breezy or rainy days lower them.
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Frequently Asked Questions About Air Quality in Lombardy
Is air quality bad in Sesto San Giovanni right now?
On 11 October 2026, overall air quality in Sesto San Giovanni is poor. AQI is the main air quality indicator at 63.8/100. Pollution peaks around 10:00 PM (PM1: 63.8/100).
Will air quality be worse tomorrow in Sesto San Giovanni?
On 12 October 2026, air quality conditions in Sesto San Giovanni will be similar to today, with AQI forecast at poor at 61.9/100. Pollution peaks around 12:00 AM (PM1: 61.9/100).
When is air pollution at its worst in Sesto San Giovanni?
The colder months, December to February, bring the most frequent inversions, when emissions from home heating and traffic are held close to the ground at around 4°C. In the warmer months, warm, sunny weather from June to September, around 25°C at its peak, raises afternoon ozone levels. Short-term changes follow the weather: calm spells raise levels, while breezy or rainy days lower them.
Are air quality levels in Sesto San Giovanni 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. |