Granby Seasonal Pollution
Granby 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
32
Rank 70 of 158 cities by average AQI
PM2.5
6.3
ug/m3 annualized city average
Seasonality
August
Cleanest: April
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Granby
39
40
27
20
27
35
40
42
30
26
23
34
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Granby, the current global analytics build covers 366 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.