What sound level is dangerous? According to Dr. Levine, regular exposure to noise above 85 decibels (分贝) is considered dangerous. The chart below offers a comparison of decibel levels to certain sounds. Here's another measurement you can use. If you're at a rock concert and the music is so loud that you have to shout to make yourself heard, you' re at risk for hearing loss. That's when wearing protective devices such as earplugs becomes critical.

　　The facts are pretty frightening. But are rock bands turning down the volume.'? Most aren't. "Rock music is supposed to be loud," says drummer Andrew Sather.

　　"I wouldn't have it any other way. And neither would the real fans of rock. "

　　Continued exposure to loud music and the failure to wear earplugs can lead to deafness, according to Dr. Levine. He states, "There's no cure for hearing loss. Your ears are trying to tell you something. That ringing is the scream of your hair cells dying. Each time that happens, more and more damage is done. "

　　Levels of Common Noises

　　Normal conversation

　　50 ? 65 dB

　　Food blender

　　88 dB

　　Jet plane flying above a person standing outside

　　103 dB

　　Rock band during a concert

　　110 ?1140 dB

　　63. From Paragraph 1, we can learn that

　　.

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