Brno Seasonal Pollution
Brno usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in May. The page uses OpenAQ-derived daily history for 3 mapped monitoring locations in South Moravian, Czech Republic.
Search city analytics
Average EPA AQI
54
Rank 23 of 61 cities by average AQI
PM2.5
13.1
ug/m3 annualized city average
Seasonality
December
Cleanest: May
Health indicator
0.6
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Brno
64
54
60
43
40
42
42
55
50
54
68
70
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Brno, the current global analytics build covers 299 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.