Most Seasonal Pollution
Most usually records its highest OpenAQ-derived EPA AQI in March and its cleanest month in April. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Ústecký Kraj, Czech Republic.
Search city analytics
Average EPA AQI
52
Rank 30 of 61 cities by average AQI
PM2.5
12.9
ug/m3 annualized city average
Seasonality
March
Cleanest: April
Health indicator
0.6
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Most
66
44
74
40
42
50
49
58
46
52
61
47
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Most, the current global analytics build covers 283 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.