Bilbao Seasonal Pollution
Bilbao usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in March. The page uses OpenAQ-derived daily history for 9 mapped monitoring locations in Basque Country, Spain.
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Average EPA AQI
42
Rank 68 of 253 cities by average AQI
PM2.5
8.6
ug/m3 annualized city average
Seasonality
November
Cleanest: March
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Bilbao
44
44
23
35
40
46
47
45
41
38
48
43
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Bilbao, the current global analytics build covers 347 daily rows from 2024-01-01 to 2024-12-31. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.