Nanaimo Seasonal Pollution
Nanaimo usually records its highest OpenAQ-derived EPA AQI in October and its cleanest month in April. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in British Columbia, Canada.
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Average EPA AQI
24
Rank 117 of 158 cities by average AQI
PM2.5
4.5
ug/m3 annualized city average
Seasonality
October
Cleanest: April
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Nanaimo
19
27
23
17
20
18
25
28
23
30
30
29
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Nanaimo, 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.