Question : The unit of noise pollution (level) is:
Option 1: decibel
Option 2: decimal
Option 3: ppm
Option 4: none of these
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Correct Answer: decibel
Solution : The correct option is decibel.
The decibel (dB) is the unit of noise pollution (level). The decibel is a logarithmic unit used to measure sound intensity. The quieter the sound, the lower the decibel level. The louder the sound, the greater the decibel level. The typical human hearing range is between 0 and 120 decibels (dB). Humans cannot hear sounds below 0 dB. Sounds that exceed 120 decibels (dB) can cause hearing impairment.
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