Hallein Seasonal Pollution
Hallein usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in May. The page uses OpenAQ-derived daily history for 8 mapped monitoring locations in Salzburg, Austria.
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Average EPA AQI
18
Rank 46 of 68 cities by average AQI
PM2.5
9.8
ug/m3 annualized city average
Seasonality
December
Cleanest: May
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Hallein
16
13
18
8
7
11
11
11
8
12
45
47
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Hallein, the current global analytics build covers 312 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.