New Zealand City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 7 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
vs
Featured comparisons
Kairaki vs Northcote→
Highest vs cleanest city
AQI gap 37360 / 96 days
Kairaki vs Timaru→
Highest-AQI pair
AQI gap 1360 / 362 days
Kairaki vs Christchurch→
High vs mid-range city
AQI gap 5360 / 360 days
Timaru vs Northcote→
Second-highest vs cleanest city
AQI gap 36362 / 96 days
Ashton vs Levin→
High vs low-AQI city
AQI gap 24357 / 59 days
Timaru vs Levin→
High vs low-AQI city
AQI gap 27362 / 59 days
Timaru vs Ashton→
Similar high-AQI cities
AQI gap 3362 / 357 days
Ashton vs Dunedin→
High vs low-AQI city
AQI gap 11357 / 161 days
Ashton vs Christchurch→
Similar high-AQI cities
AQI gap 1357 / 360 days
Christchurch vs Dunedin→
Similar high-AQI cities
AQI gap 10360 / 161 days
Dunedin vs Levin→
Similar high-AQI cities
AQI gap 13161 / 59 days
Levin vs Northcote→
Similar high-AQI cities
AQI gap 959 / 96 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.