Vratsa Seasonal Pollution
Vratsa usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in April. The page uses OpenAQ-derived daily history for 4 mapped monitoring locations in Vratsa, Bulgaria.
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Average EPA AQI
36
Rank 22 of 35 cities by average AQI
PM2.5
10.6
ug/m3 annualized city average
Seasonality
November
Cleanest: April
Health indicator
0.5
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Vratsa
22
22
27
17
37
35
38
38
40
42
58
50
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Vratsa, the current global analytics build covers 351 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.