What is the air quality trend in Sofia?

Over the past 8 days, Sofia had an average AQI of 33 based on station measurements. The worst day was with AQI .

How is Sofia air quality measured?

Air quality in Sofia is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Sofia, BG

Name: Sofia Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Sofia, BG.

Current AQI
Good

48 Hours 7 Days 14 Days 20 Days

PM2.5 Trend

111h · 43 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-10	41	23–63	10.2 µg/m³	13.7	22h	43
2026-04-09	41	21–134	10.9 µg/m³	14.7	19h	33
2026-04-08	23	21–26	5.4 µg/m³	7.7	9h	43
2026-04-07	33	21–56	8.0 µg/m³	11.0	24h	42
2026-04-06	39	16–144	10.7 µg/m³	14.9	18h	40
2026-04-05	19	17–21	4.5 µg/m³	6.5	2h	1
2026-04-04	40	26–62	10.0 µg/m³	13.4	15h	44
2026-04-03	28	27–30	6.8 µg/m³	9.3	2h	44

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