Ultrasound in air – guidelines, applications, public exposures and claims of attacks in Cuba and China

This editorial introduces a Special Issue of the Journal of the Acoustical Society of America, on ‘Ultrasound in Air’. In this Special Issue, one paper covers ways of categorizing the ultrasonic regimes, and three papers cover human effects. One of those three, plus five others, constitute the six papers that report on the measured outputs of commercial devices. Two cover calibration, and the final three papers cover novel applications.This editorial outlines the context in which these papers provide individual studies, including the development of technology and guidelines for safe exposure, and ending with an analysis of what is currently known about claims of sonic attacks on embassy staff in Cuba and China