Air quality in Siena today
Italy · Updated Friday 01:00 (local time) · Model data from the Copernicus Atmosphere Monitoring Service
Fair European AQI
Fine for almost everyone.
Pollutants right now
| Pollutant | Value | Level |
|---|---|---|
| PM2.5 | 6 µg/m³ | Good |
| PM10 | 11 µg/m³ | Good |
| NO₂ | 3 µg/m³ | Good |
| O₃ | 65 µg/m³ | Fair |
The pollutant that matters most in Siena right now is O₃.
Forecast: next 24 hours
The air in Siena should stay good to fair for the next 24 hours. The cleanest hour is expected around Fri 07:00.
| Time | AQI | Level | PM2.5 |
|---|---|---|---|
| Fri 02:00 | 22 | Fair | 6 |
| Fri 05:00 | 23 | Fair | 7 |
| Fri 08:00 | 25 | Fair | 4 |
| Fri 11:00 | 32 | Fair | 3 |
| Fri 14:00 | 34 | Fair | 2 |
| Fri 17:00 | 35 | Fair | 2 |
| Fri 20:00 | 29 | Fair | 3 |
| Fri 23:00 | 26 | Fair | 3 |
The last 30 days
Over the last 30 days the average daily AQI in Siena was 27, with 0 day(s) rated poor or worse. The cleanest day was 10 Sept, the most polluted 14 Sept.
Questions and answers
- Is the air in Siena good today?
- Right now the European Air Quality Index in Siena is 23, which is fair. Fine for almost everyone.
- What pollutes the air in Siena?
- At the moment O₃ contributes most to the air quality index in Siena. The index takes the worst of fine particles (PM2.5), coarser particles (PM10), nitrogen dioxide, ozone and sulphur dioxide.
- When will the air in Siena be cleanest?
- The air in Siena should stay good to fair for the next 24 hours. The cleanest hour is expected around Fri 07:00.
- Where does this data come from?
- Wheezair shows model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), served by Open-Meteo: about 11 km resolution in Europe and 40 km elsewhere, updated daily. They are not station measurements, so a busy street can be worse than its city's value.