It would take 4 hours for your hearing to be damaged without hearing protection.
Personal protective equipment (PPE) are equipment worn to minimize exposure to hazards that cause serious workplace injuries and illnesses. Personal protective include items such as gloves, safety glasses and shoes, earplugs or muffs.
The sound of a lawn mower has a decibel level of 90dB. Hence, hearing begins to be damaged after 4 hours of exposure to this sound.
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