What is the air quality trend in Sofia?

Over the past 2 days, Sofia had an average AQI of 40 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

39h · 45 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-10	40	23–61	10.0 µg/m³	13.5	20h	43
2026-04-09	41	21–134	10.9 µg/m³	14.7	19h	33

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