France City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 272 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
vs
Featured comparisons
Grigny vs Sarzeau→
Highest vs cleanest city
AQI gap 6936 / 148 days
Grigny vs Palaiseau→
Highest-AQI pair
AQI gap 536 / 92 days
Grigny vs Poitiers→
High vs mid-range city
AQI gap 3236 / 305 days
Palaiseau vs Sarzeau→
Second-highest vs cleanest city
AQI gap 6492 / 148 days
Saint-Denis vs Belfort→
High vs low-AQI city
AQI gap 42200 / 179 days
Palaiseau vs Belfort→
High vs low-AQI city
AQI gap 4892 / 179 days
Palaiseau vs Saint-Denis→
Similar high-AQI cities
AQI gap 692 / 200 days
Saint-Denis vs Borgo→
High vs low-AQI city
AQI gap 42200 / 275 days
Saint-Denis vs Saverne→
Similar high-AQI cities
AQI gap 1200 / 171 days
Saverne vs Le Puy-en-Velay→
High vs low-AQI city
AQI gap 39171 / 317 days
Saverne vs Juvignac→
Similar high-AQI cities
AQI gap 1171 / 263 days
Juvignac vs Panazol→
High vs low-AQI city
AQI gap 38263 / 182 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.