North Cowichan Seasonal Pollution
North Cowichan usually records its highest OpenAQ-derived EPA AQI in July and its cleanest month in April. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in British Columbia, Canada.
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Average EPA AQI
20
Rank 152 of 158 cities by average AQI
PM2.5
3.6
ug/m3 annualized city average
Seasonality
July
Cleanest: April
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
North Cowichan
19
18
17
11
17
14
26
25
24
20
19
18
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For North Cowichan, the current global analytics build covers 336 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.