AQI or Aqi may refer to: Air quality index "Al-Qaeda in Iraq", common English substitute name for the Iraq-based Tanzim Qaidat al-Jihad fi Bilad al-Rafidayn Australian Questioning Intonation, a feature of some accents of English AQ Interactive, a former Japanese video game developer and publisher A'Qi, a character from the wuxia novel The Deer and the Cauldron