New Westminster Seasonal Pollution
New Westminster usually records its highest OpenAQ-derived EPA AQI in July and its cleanest month in March. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in British Columbia, Canada.
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Average EPA AQI
25
Rank 111 of 158 cities by average AQI
PM2.5
4.6
ug/m3 annualized city average
Seasonality
July
Cleanest: March
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
New Westminster
22
19
19
20
24
25
33
32
28
26
26
26
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For New Westminster, 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.