Ostrava Seasonal Pollution
Ostrava usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in September. The page uses OpenAQ-derived daily history for 3 mapped monitoring locations in South Moravian, Czech Republic.
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Average EPA AQI
59
Rank 18 of 61 cities by average AQI
PM2.5
16.7
ug/m3 annualized city average
Seasonality
December
Cleanest: September
Health indicator
0.8
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Ostrava
69
53
69
54
53
47
53
43
34
63
67
78
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Ostrava, the current global analytics build covers 306 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.