On the AirVisual app and monitor, you can choose to display either US or China AQI. The tables below help you to understand how pollutant concentrations are different when China AQI and US AQI indexes are showing the same value range.
Reference:
US standard: https://www.epa.gov/system/files/documents/2024-02/pm-naaqs-air-quality-index-fact-sheet.pdf
https://www.airnow.gov/sites/default/files/2020-05/aqi-technical-assistance-document-sept2018.pdf
China standard: https://web.archive.org/web/20180830110324/http://kjs.mep.gov.cn/hjbhbz/bzwb/jcffbz/201203/W020120410332725219541.pdf