Air Quality in Siena, Italy
Rain
15.3°C · 88.7% humidity
15.3°
Feels 15.3°
28
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Siena's air quality — share it
AQI Forecast
54
10pm
54
54
28
1am
35
41
44
4am
47
49
50
7am
51
52
33
10am
33
26
27
1pm
27
27
27
4pm
27
27
27
7pm
34
34
Siena's air quality is shaped by traffic emissions and residential heating. Pollution levels tend to peak during winter months when cold air traps emissions close to ground level. Current PM2.5 concentration in Siena is 1.3× the WHO annual guideline of 5 µg/m³.
88.7%
Humidity
23.3 km/h
Wind S
1010.9 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
6.6 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Siena?
Temperature & Precipitation
PM2.56.6 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for Siena?
05-28
26.1° 15.4°
0.19 mm
05-29
19.3° 14.0°
15.31 mm
05-30
18.9° 12.9°
10.75 mm
05-31
24.8° 11.6°
0.06 mm
06-01
27.0° 14.5°
0.13 mm
06-02
21.8° 14.6°
6.19 mm
06-03
26.9° 13.4°
Both models agree
Avg diff: 3.9°C
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-28T23:08 UTC.