Calgary Seasonal Pollution
Calgary usually records its highest OpenAQ-derived EPA AQI in July and its cleanest month in June. The page uses OpenAQ-derived daily history for 9 mapped monitoring locations in Alberta, Canada.
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Average EPA AQI
42
Rank 14 of 158 cities by average AQI
PM2.5
10.2
ug/m3 annualized city average
Seasonality
July
Cleanest: June
Health indicator
0.5
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Calgary
55
38
41
28
33
24
65
62
37
28
47
47
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Calgary, 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.