Siena Seasonal Pollution
Siena usually records its highest OpenAQ-derived EPA AQI in February and its cleanest month in April. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Tuscany, Italy.
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Average EPA AQI
16
Rank 118 of 132 cities by average AQI
PM2.5
n/a
ug/m3 annualized city average
Seasonality
February
Cleanest: April
Health indicator
n/a
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Siena
19
20
11
11
18
16
15
18
14
14
19
13
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Siena, the current global analytics build covers 165 daily rows from 2024-01-01 to 2024-12-30. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.