China City AQI Comparison
Rank cities side by side using OpenAQ PM2.5 and PM10 history normalized to US EPA AQI. This pilot covers 6 eligible cities with OpenAQ-derived daily AQI history.
Compare two cities
vs
Featured comparisons
Beijing vs Hohhot→
Highest vs cleanest city
AQI gap 82357 / 78 days
Beijing vs Shenyang→
Highest-AQI pair
AQI gap 0357 / 249 days
Beijing vs Shanghai→
High vs mid-range city
AQI gap 28357 / 287 days
Shenyang vs Hohhot→
Second-highest vs cleanest city
AQI gap 82249 / 78 days
Huajing vs Guangzhou→
High vs low-AQI city
AQI gap 13244 / 361 days
Shenyang vs Guangzhou→
High vs low-AQI city
AQI gap 30249 / 361 days
Shenyang vs Huajing→
Similar high-AQI cities
AQI gap 17249 / 244 days
Huajing vs Shanghai→
High vs low-AQI city
AQI gap 11244 / 287 days
Shanghai vs Guangzhou→
Similar high-AQI cities
AQI gap 2287 / 361 days
Guangzhou vs Hohhot→
Similar high-AQI cities
AQI gap 52361 / 78 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.