Piedras Negras Seasonal Pollution
Piedras Negras usually records its highest OpenAQ-derived EPA AQI in April and its cleanest month in February. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Coahuila, Mexico.
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Average EPA AQI
87
Rank 12 of 86 cities by average AQI
PM2.5
88.9
ug/m3 annualized city average
Seasonality
April
Cleanest: February
Health indicator
4.0
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Piedras Negras
-
43
44
253
65
53
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-
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What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Piedras Negras, the current global analytics build covers 56 daily rows from 2024-01-15 to 2024-06-18. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.