Trail Seasonal Pollution
Trail usually records its highest OpenAQ-derived EPA AQI in January and its cleanest month in June. The page uses OpenAQ-derived daily history for 5 mapped monitoring locations in British Columbia, Canada.
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Average EPA AQI
40
Rank 19 of 158 cities by average AQI
PM2.5
8.6
ug/m3 annualized city average
Seasonality
January
Cleanest: June
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Trail
52
41
33
32
27
25
51
46
39
45
46
45
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Trail, the current global analytics build covers 361 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.