China AQI Trends
Compare yearly air-quality direction, best years, worst years, and trend deltas. This pilot covers 4 eligible cities with OpenAQ-derived daily AQI history.
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Yearly EPA AQI trend
City analytics table
| City | Avg AQI | PM2.5 | Worst month | Trend | Coverage |
|---|---|---|---|---|---|
| Beijing Beijing, China | 111 | 43.1 ug/m3 | April | n/a | 357 days · 2 locations |
| Shenyang Liaoning, China | 111 | 44.3 ug/m3 | February | n/a | 249 days · 1 locations |
| Huajing Shanghai, China | 94 | 34.9 ug/m3 | January | n/a | 244 days · 1 locations |
| Shanghai Shanghai, China | 83 | 25.9 ug/m3 | December | n/a | 287 days · 1 locations |
| Guangzhou Guangdong, China | 81 | 24.9 ug/m3 | December | n/a | 361 days · 1 locations |
| Hohhot Inner Mongolia, China | 29 | 7.1 ug/m3 | January | n/a | 78 days · 1 locations |
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.