Longueuil Seasonal Pollution
Longueuil usually records its highest OpenAQ-derived EPA AQI in August and its cleanest month in April. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Quebec, Canada.
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Average EPA AQI
36
Rank 35 of 158 cities by average AQI
PM2.5
7.9
ug/m3 annualized city average
Seasonality
August
Cleanest: April
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Longueuil
36
41
28
21
31
41
49
50
39
28
23
44
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Longueuil, 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.