Chillán Seasonal Pollution
Chillán usually records its highest OpenAQ-derived EPA AQI in May and its cleanest month in November. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Ñuble, Chile.
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Average EPA AQI
91
Rank 24 of 60 cities by average AQI
PM2.5
31.7
ug/m3 annualized city average
Seasonality
May
Cleanest: November
Health indicator
1.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Chillán
67
70
71
91
147
108
138
116
88
70
61
64
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Chillán, the current global analytics build covers 362 daily rows from 2024-01-01 to 2025-01-01. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.