Alcalá de Henares Seasonal Pollution
Alcalá de Henares usually records its highest OpenAQ-derived EPA AQI in August and its cleanest month in March. The page uses OpenAQ-derived daily history for 3 mapped monitoring locations in Madrid, Spain.
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Average EPA AQI
49
Rank 22 of 253 cities by average AQI
PM2.5
10.7
ug/m3 annualized city average
Seasonality
August
Cleanest: March
Health indicator
0.5
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Alcalá de Henares
52
45
31
48
42
48
50
61
49
51
53
56
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Alcalá de Henares, the current global analytics build covers 278 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.