1. The decibel (dB) scale measures sound intensity or noise level logarithmically.
2. Just audible sound is around 0 dB.
3. Ordinary conversation is typically around 60 dB.
4. A noisy street environment might range from 70 to 85 dB.
5. A noise level of 100 decibels is very loud and characteristic of environments like a machine shop, construction site, or near a subway train.