Final answer:
Sustained exposure to sounds over 85 decibels can cause hearing damage. Protective measures, like wearing earplugs and reducing exposure time, are essential when around loud noises like rock music or jackhammers.
Step-by-step explanation:
Hearing damage occurs from sustained sound at a volume of over 85 decibels (dB). Exposure to sounds above 80 dB can lead to hearing loss over time, and government agencies recommend not exceeding 85 dB for 8-hour daily exposures without hearing protection. Loud environments like those with rock music or the sound of a jackhammer can rapidly increase the risk of hearing damage. It's important to take precautions such as wearing earplugs and limiting exposure time to protect one's hearing.