Chilliwack Seasonal Pollution
Chilliwack usually records its highest OpenAQ-derived EPA AQI in August and its cleanest month in January. The page uses OpenAQ-derived daily history for 4 mapped monitoring locations in British Columbia, Canada.
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Average EPA AQI
24
Rank 118 of 158 cities by average AQI
PM2.5
4.5
ug/m3 annualized city average
Seasonality
August
Cleanest: January
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Chilliwack
18
21
25
23
22
21
33
33
29
21
25
19
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Chilliwack, 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.