Canada City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 158 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
vs
Featured comparisons
Cambridge vs Williams Lake→
Highest vs cleanest city
AQI gap 34224 / 367 days
Cambridge vs East St. Paul→
Highest-AQI pair
AQI gap 0224 / 186 days
Cambridge vs Lethbridge→
High vs mid-range city
AQI gap 19224 / 361 days
East St. Paul vs Williams Lake→
Second-highest vs cleanest city
AQI gap 34186 / 367 days
Welland vs Campbell River→
High vs low-AQI city
AQI gap 33143 / 360 days
East St. Paul vs Campbell River→
High vs low-AQI city
AQI gap 34186 / 360 days
East St. Paul vs Welland→
Similar high-AQI cities
AQI gap 1186 / 143 days
Welland vs Kentville→
High vs low-AQI city
AQI gap 30143 / 367 days
Welland vs Wood Buffalo→
Similar high-AQI cities
AQI gap 1143 / 365 days
Wood Buffalo vs Edmundston→
High vs low-AQI city
AQI gap 29365 / 348 days
Wood Buffalo vs Yellowknife→
Similar high-AQI cities
AQI gap 0365 / 212 days
Yellowknife vs Tsawwassen→
High vs low-AQI city
AQI gap 29212 / 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.