Liège Seasonal Pollution
Liège usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in April. The page uses OpenAQ-derived daily history for 3 mapped monitoring locations in Wallonia, Belgium.
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Average EPA AQI
40
Rank 47 of 67 cities by average AQI
PM2.5
9.4
ug/m3 annualized city average
Seasonality
November
Cleanest: April
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Liège
45
31
33
19
34
34
30
48
54
45
59
49
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Liège, the current global analytics build covers 352 daily rows from 2024-01-01 to 2024-12-31. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.