Los Ángeles Seasonal Pollution
Los Ángeles usually records its highest OpenAQ-derived EPA AQI in May and its cleanest month in January. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Biobío, Chile.
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Average EPA AQI
85
Rank 35 of 60 cities by average AQI
PM2.5
28.2
ug/m3 annualized city average
Seasonality
May
Cleanest: January
Health indicator
1.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Los Ángeles
60
66
69
88
137
101
122
105
81
67
63
63
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Los Ángeles, the current global analytics build covers 364 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.