Switzerland City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 33 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
vs
Featured comparisons
Hochdorf vs Küssnacht→
Highest vs cleanest city
AQI gap 6034 / 256 days
Hochdorf vs Aarau→
Highest-AQI pair
AQI gap 1234 / 163 days
Hochdorf vs Riehen→
High vs mid-range city
AQI gap 3134 / 363 days
Aarau vs Küssnacht→
Second-highest vs cleanest city
AQI gap 48163 / 256 days
Allschwil vs Ostermundigen→
High vs low-AQI city
AQI gap 45114 / 227 days
Aarau vs Ostermundigen→
High vs low-AQI city
AQI gap 46163 / 227 days
Aarau vs Allschwil→
Similar high-AQI cities
AQI gap 1163 / 114 days
Allschwil vs Sursee→
High vs low-AQI city
AQI gap 38114 / 209 days
Allschwil vs Langenthal→
Similar high-AQI cities
AQI gap 10114 / 221 days
Langenthal vs Winterthur→
High vs low-AQI city
AQI gap 21221 / 245 days
Langenthal vs Opfikon→
Similar high-AQI cities
AQI gap 3221 / 364 days
Opfikon vs Payerne→
High vs low-AQI city
AQI gap 17364 / 256 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.