Lethbridge Seasonal Pollution
Lethbridge 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 Alberta, Canada.
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Average EPA AQI
31
Rank 80 of 158 cities by average AQI
PM2.5
6.5
ug/m3 annualized city average
Seasonality
July
Cleanest: April
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Lethbridge
26
25
32
21
22
25
52
45
30
28
32
30
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Lethbridge, 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.