The World Health Organisation (WHO) is (1) WORRY that 1.1 billion teenagers and people in their twenties and early thirties are damaging their (2) HEAR by listening to loud music. It says (3) NEAR half the young people in middle and high-income countries risk hearing loss because of the "(4) SAFETY use" of personal music (5) PLAY, including smartphones. Loud music in nightclubs, bars and at sporting events also increases the risk. The WHO recommends a safe (6) LIMITED of listening to music for just one hour a day. The WHO director for (7) INJURE prevention, Dr Etienne Krug, told the BBC that: "What we're trying to do is raise (8) AWARE of an issue that is not (9) TALK about enough." He said hearing loss is easily (10) PREVENT.