Air Quality Index (AQI) in Bulgaria 🇧🇬

Live Air Quality Index (AQI) and PM2.5 Levels in Bulgaria

Currently, the Air Quality Index (AQI) in Sofia, the capital of Bulgaria, is measured at a score of 57. According to the US EPA health standard, this air quality rating is categorized as Good. The current atmosphere in Sofia is influenced by a PM2.5 (fine particulate matter) concentration of 12.2 µg/m³ and PM10 levels recorded at 16.9 µg/m³. Monitoring of gaseous pollutants shows Nitrogen Dioxide (NO2) at 8.0 µg/m³.

Beyond the primary urban hubs, atmospheric conditions and smog levels fluctuate across Bulgaria based on industrial output, traffic density, and local weather patterns. Real-time pollution data and respiratory health alerts are also being actively monitored in cities like Plovdiv, Varna, Burgas, Stara Zagora and Ruse. Tracking these air quality metrics is essential for residents nationwide to manage outdoor exposure and maintain respiratory safety during periods of increased particulate concentration.

Air Quality Snapshot: Bulgaria Right Now

Across 11 monitored cities in Bulgaria, live air quality currently ranges from a low of 36 AQI in Ruse (the cleanest air right now) to a high of 57 AQI in Sofia (the most polluted). By US EPA health band, the nationwide distribution stands at 6 Good, 5 Moderate. The average fine-particulate (PM2.5) concentration across these cities is 9.2 µg/m³ — approximately 1.8 times the World Health Organization (WHO) annual air quality guideline of 5 µg/m³.

Bulgaria Air Quality: Major Cities Index

* Air Quality Index (AQI) data for Bulgaria is calculated using the US EPA standard. Information is processed from multiple monitoring stations detecting PM2.5, PM10, and gaseous pollutants to ensure accuracy for respiratory health planning.

What Today's Readings Mean in Bulgaria

The median reading across 11 monitored cities is 50 AQI. The national spread is 21 points, from 36 in Ruse to 57 in Sofia. Average PM2.5 is 9.2 µg/m³ (1.8× the WHO annual guideline).

At least one monitored location is in the Moderate range. People unusually sensitive to air pollution may want to reduce prolonged outdoor exertion there.

See the complete AQI and pollutant reference scales

Health & Scientific Resources

→ How to read US EPA Air Quality Index before going outside → Understanding Air Quality Index levels and what they mean → When haze forms and what it does to air quality

Air Quality in Bulgaria — FAQ

Common questions about AQI levels, pollutants, and data sources for Bulgaria.

What is the current air quality in Bulgaria?

Live AQI readings for 11 city(ies) across Bulgaria are listed above on the US EPA 0-500 scale.

Where does Bulgaria's AQI data come from?

Real-time readings come from ground-based monitoring stations operated by national environmental agencies in Bulgaria, delivered via WeatherAPI.com and aggregated using the EPA AQI formula.

What is a healthy AQI value in Bulgaria?

On the EPA scale used worldwide, 0-50 is Good, 51-100 is Moderate, 101-150 is Unhealthy for sensitive groups, 151-200 is Unhealthy, 201-300 is Very Unhealthy, and 301-500 is Hazardous. The WHO 24-hour PM2.5 guideline is 15 μg/m³.

Why do AQI readings vary between cities in Bulgaria?

Air quality is highly local — major pollution sources (traffic, industry, dust, wildfires) cluster around cities, while wind direction and topography move them around. Comparing nearby readings on this page is the best way to see how conditions change across Bulgaria.