Bulgaria City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 35 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
vs
Featured comparisons
Svishtov vs Sofia→
Highest vs cleanest city
AQI gap 131363 / 341 days
Svishtov vs Veliko Tarnovo→
Highest-AQI pair
AQI gap 65363 / 79 days
Svishtov vs Varna→
High vs mid-range city
AQI gap 110363 / 160 days
Veliko Tarnovo vs Sofia→
Second-highest vs cleanest city
AQI gap 6679 / 341 days
Razgrad vs Vratsa→
High vs low-AQI city
AQI gap 2841 / 351 days
Veliko Tarnovo vs Vratsa→
High vs low-AQI city
AQI gap 6179 / 351 days
Veliko Tarnovo vs Razgrad→
Similar high-AQI cities
AQI gap 3379 / 41 days
Razgrad vs Dimitrovgrad→
High vs low-AQI city
AQI gap 2741 / 367 days
Razgrad vs Velingrad→
Similar high-AQI cities
AQI gap 441 / 357 days
Velingrad vs Gabrovo→
High vs low-AQI city
AQI gap 19357 / 363 days
Velingrad vs Botevgrad→
Similar high-AQI cities
AQI gap 2357 / 363 days
Botevgrad vs Dobrich→
High vs low-AQI city
AQI gap 13363 / 366 days
Methodology
The extractor maps OpenAQ monitoring locations to the nearest AQI Now city in the same country, aggregates PM2.5 and PM10 to daily city averages, and converts those concentrations to US EPA AQI. Country tool pages use only city summaries that satisfy the configured minimum daily coverage threshold.