La Unión Seasonal Pollution
La Unión usually records its highest OpenAQ-derived EPA AQI in May and its cleanest month in January. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Los Ríos, Chile.
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Average EPA AQI
98
Rank 9 of 60 cities by average AQI
PM2.5
34.5
ug/m3 annualized city average
Seasonality
May
Cleanest: January
Health indicator
1.6
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
La Unión
59
60
73
95
152
113
144
139
115
83
70
64
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For La Unión, the current global analytics build covers 350 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.