South Korea City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 100 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
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Featured comparisons
Pyeongtaek vs Taebaek→
Highest vs cleanest city
AQI gap 22287 / 286 days
Pyeongtaek vs Gimpo→
Highest-AQI pair
AQI gap 0287 / 287 days
Pyeongtaek vs Ansan→
High vs mid-range city
AQI gap 10287 / 287 days
Gimpo vs Taebaek→
Second-highest vs cleanest city
AQI gap 22287 / 286 days
Sapkyo vs Ulchin→
High vs low-AQI city
AQI gap 21286 / 286 days
Gimpo vs Ulchin→
High vs low-AQI city
AQI gap 22287 / 286 days
Gimpo vs Sapkyo→
Similar high-AQI cities
AQI gap 1287 / 286 days
Sapkyo vs Sa-ch’on→
High vs low-AQI city
AQI gap 20286 / 286 days
Sapkyo vs Tangjin→
Similar high-AQI cities
AQI gap 0286 / 286 days
Tangjin vs Chuncheon→
High vs low-AQI city
AQI gap 18286 / 287 days
Tangjin vs Hwasu-dong→
Similar high-AQI cities
AQI gap 1286 / 286 days
Hwasu-dong vs Haeryong→
High vs low-AQI city
AQI gap 16286 / 286 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.