Mexico City Seasonal Pollution
Mexico City usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in October. The page uses OpenAQ-derived daily history for 4 mapped monitoring locations in Mexico City, Mexico.
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Average EPA AQI
78
Rank 22 of 86 cities by average AQI
PM2.5
24.3
ug/m3 annualized city average
Seasonality
December
Cleanest: October
Health indicator
1.1
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Mexico City
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68
81
82
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Mexico City, the current global analytics build covers 65 daily rows from 2024-10-18 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.