SmogRank / Cleaner or dirtier / Bulgaria
Bulgaria: cleaner or dirtier, 2026
In Bulgaria, 7 cities have enough days in both years to compare 2026 so far (1 January to 6 October) with the same days of 2025: 0 got dirtier and 7 cleaner.
The 7 cities that got cleaner, biggest fall first
| # | City | 2025 | 2026 | Change |
|---|---|---|---|---|
| 1 | DimitrovgradHaskovo, Bulgaria | 58 | 52 | −3.3 µg/m³−26% |
| 2 | HaskovoBulgaria | 56 | 49 | −3.2 µg/m³−27% |
| 3 | SevlievoGabrovo, Bulgaria | 56 | 49 | −2.7 µg/m³−23% |
| 4 | GabrovoBulgaria | 53 | 46 | −1.9 µg/m³−19% |
| 5 | RuseBulgaria | 62 | 58 | −1.8 µg/m³−12% |
| 6 | VarnaBulgaria | 54 | 52 | −1.0 µg/m³−10% |
| 7 | SofiaSofia-Capital, Bulgaria | 56 | 55 | −0.8 µg/m³−7% |
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.