SmogRank / Cleaner or dirtier / Bulgaria
Bulgaria: cleaner or dirtier, 2025
In Bulgaria, 5 cities have enough days in both years to compare 2025 with the same days of 2024: 4 got dirtier and 1 cleaner.
The 4 cities that got dirtier, biggest rise first
| # | City | 2024 | 2025 | Change |
|---|---|---|---|---|
| 1 | BotevgradSofia, Bulgaria | 56 | 60 | +2.1 µg/m³+18% |
| 2 | DimitrovgradHaskovo, Bulgaria | 52 | 54 | +0.9 µg/m³+9% |
| 3 | GabrovoBulgaria | 53 | 54 | +0.5 µg/m³+5% |
| 4 | HaskovoBulgaria | 57 | 58 | +0.4 µg/m³+3% |
The one city that got cleaner
| # | City | 2024 | 2025 | Change |
|---|---|---|---|---|
| 1 | SevlievoGabrovo, Bulgaria | 57 | 56 | −0.2 µg/m³−2% |
Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.