What is the air quality trend in Sofia?

Over the past 15 days, Sofia had an average AQI of 31 based on station measurements. The worst day was 2026-05-22 with AQI 45.

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, Bulgaria

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, Bulgaria.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

335h

PM2.5 Station

335h · 21 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	20	9–40	4.8 µg/m³	6.7	22h	21
2026-05-28	32	16–51	7.6 µg/m³	9.9	24h	22
2026-05-27	36	15–71	9.2 µg/m³	11.8	24h	21
2026-05-26	42	22–65	10.3 µg/m³	13.1	24h	22
2026-05-25	36	14–63	8.7 µg/m³	11.3	24h	23
2026-05-24	37	16–57	9.0 µg/m³	11.4	24h	22
2026-05-23	33	13–54	8.0 µg/m³	10.2	24h	23
2026-05-22	45	16–79	11.7 µg/m³	14.7	23h	22
2026-05-21	29	14–44	7.1 µg/m³	9.1	24h	23
2026-05-20	35	20–112	9.0 µg/m³	11.2	24h	22
2026-05-19	25	9–49	5.9 µg/m³	7.8	24h	24
2026-05-18	26	8–41	6.3 µg/m³	8.3	24h	24
2026-05-17	20	7–123	5.9 µg/m³	7.6	24h	23
2026-05-16	27	9–51	6.5 µg/m³	8.6	24h	24
2026-05-15	32	29–36	7.8 µg/m³	10.0	2h	25

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