Air quality in Sofia, Sofia-City, Bulgaria today

Mr. Duck’s Air Quality Score

Moderate air today for Sofia, Sofia-City, Bulgaria

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Sofia today is classified as Moderate. The primary pollutant measured is PM2.5, with a recorded concentration of 28.42 µg/m³, while PM10 stands at 25.32 µg/m³ based on 22 valid observations.

Data are shown via OpenAQ and reflect the current monitoring results for Sofia‑City, Bulgaria. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The OpenAQ feed for Sofia‑City currently contains data from 13 monitoring sites spread across the metropolitan area, amounting to 76 individual measurement rows. The dataset covers a full suite of common air‑quality variables: carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO2), ozone (O3), sulfur dioxide (SO2), particulate matter in four size fractions (PM1, PM2.5, PM4 and PM10), as well as basic meteorological parameters – temperature, pressure, humidity, relative humidity and a generic “UM003” field.

Across the pollutants, the most recent observations were recorded on 2026‑02‑10 at either 19:00 or 22:00 UTC, so the freshest data are no older than three days. However, the number of rows that actually contain a valid reading varies widely. For PM10 there are 12 recent samples with a median concentration of about 15 µg/m³ and an extreme range from –1 to 106 µg/m³; for PM2.5 the median is roughly 20 µg/m³ (range –1 to 105 µg/m³) based on ten rows, while PM1 shows a tighter spread with a minimum of 4.8 µg/m³ and a maximum of 100 µg/m³ across eight entries. In contrast, gases such as CO, NO2, SO2 and O3 each have only five to seven recent rows, and many of those values are recorded as –1 or –1000, indicating missing or placeholder data rather than actual measurements.

Overall the dataset provides a fairly up‑to‑date picture for particulate matter but is sparse for several key gases, with roughly half of the rows flagged as “old” or “unknown”. Because monitoring locations differ and some pollutants are only intermittently reported, conditions in Sofia can vary noticeably from one neighbourhood to another and from hour to hour. Users should therefore treat the figures as a snapshot rather than a comprehensive, city‑wide average.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The dataset for Sofia includes 22 valid measurements and is marked as Updated within 3 days, with the latest values recorded on 2026‑02‑10T22:00:00+00:00. These figures represent a recent snapshot of ambient conditions across the city; however, air quality can differ by specific location and time of day, so individual experiences may vary from the reported averages.

OpenAQ station rows