Sliven Seasonal Pollution
Sliven usually records its highest OpenAQ-derived EPA AQI in March and its cleanest month in August. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Sliven, Bulgaria.
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Average EPA AQI
22
Rank 26 of 35 cities by average AQI
PM2.5
n/a
ug/m3 annualized city average
Seasonality
March
Cleanest: August
Health indicator
n/a
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Sliven
29
28
33
23
14
16
15
13
21
23
26
21
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Sliven, the current global analytics build covers 318 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.