Montmagny Seasonal Pollution
Montmagny usually records its highest OpenAQ-derived EPA AQI in August and its cleanest month in November. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Quebec, Canada.
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Average EPA AQI
22
Rank 135 of 158 cities by average AQI
PM2.5
4.3
ug/m3 annualized city average
Seasonality
August
Cleanest: November
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Montmagny
20
17
14
13
20
29
36
43
26
20
12
19
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Montmagny, the current global analytics build covers 363 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.