Langley Seasonal Pollution
Langley usually records its highest OpenAQ-derived EPA AQI in August and its cleanest month in June. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in British Columbia, Canada.
Search city analytics
Average EPA AQI
24
Rank 121 of 158 cities by average AQI
PM2.5
4.4
ug/m3 annualized city average
Seasonality
August
Cleanest: June
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Langley
21
24
25
26
23
20
26
29
21
23
27
23
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Langley, 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.