Decibels (db) are a measurement of environmental noise. This chart from the United States Department of Labor showcases a spectrum of sounds and their decibel levels.
When looking into hearing protection devices, you will see the acronym: "NRR." The noise reduction rating (NRR) refers to the amount of sound (dB) reduction a hearing protection device provides when worn properly.
The higher the NRR number, the more hearing protection. For example, a pair of NRR: 30 rated earplugs would provide more auditory protection than a NRR: 27 rated pair of earplugs.
OSHA standards require the use of ear protection for employees that are exposed to noise at or above 85 dB for an 8 hour weighted average.
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