A WHO-ITU Standard. Nearly 50% of people aged 12-35 years – or 1.1 billion young people – are at risk of hearing loss due to prolonged and excessive exposure to loud sounds, including music they listen to through personal audio devices. Ahead of World Hearing Day (3 March), the World Health Organization (WHO) and the International Telecommunication Union (ITU) have issued a new international standard for the manufacture and use of these devices, which include smartphones and audio players, to make them safer for listening