Saint-Jean-sur-Richelieu Seasonal Pollution
Saint-Jean-sur-Richelieu usually records its highest OpenAQ-derived EPA AQI in August and its cleanest month in April. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Quebec, Canada.
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Average EPA AQI
27
Rank 102 of 158 cities by average AQI
PM2.5
5.1
ug/m3 annualized city average
Seasonality
August
Cleanest: April
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Saint-Jean-sur-Richelieu
29
33
20
17
26
31
33
35
26
21
19
29
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Saint-Jean-sur-Richelieu, the current global analytics build covers 367 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.