Noise levels refer to the intensity of sound in a given environment, typically measured in decibels (dB). A higher decibel level indicates louder sounds, while lower levels represent quieter sounds. For example, a whisper is around 30 dB, normal conversation is about 60 dB, and a rock concert can reach 120 dB. Understanding noise levels is important for health and safety. Prolonged exposure to high noise levels can lead to hearing loss and increased stress. Many cities monitor noise levels to ensure they remain within acceptable limits, protecting residents from excessive noise pollution.