Sofia AQI Trends
Sofia AQI was measured across 2023-2024, with a trend delta of n/a AQI points. The page uses OpenAQ-derived daily history for 7 mapped monitoring locations in Sofia City, Bulgaria.
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Average EPA AQI
51
Rank 15 of 35 cities by average AQI
PM2.5
12.4
ug/m3 annualized city average
Seasonality
January
Cleanest: April
Health indicator
0.6
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Sofia
84
66
55
34
38
39
40
41
44
49
54
61
What this trends page measures
Compare yearly air-quality direction, best years, worst years, and trend deltas.
For Sofia, the current global analytics build covers 367 daily rows from 2023-12-31 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.