What is the noise level in decibels linked to hearing damage if exposure lasts for 8 hours?

The correct answer, 85 decibels, is significant because it represents the threshold level established by occupational safety guidelines for permissible exposure to noise over an 8-hour workday. Prolonged exposure to noise levels at or above this decibel level can lead to Noise-Induced Hearing Loss (NIHL). This is due to the damage that loud sounds can cause to the delicate hair cells in the inner ear, which are crucial for hearing.

Evidence from various studies shows that when exposure occurs at 85 decibels or above, the risk of hearing damage increases substantially, making protective measures necessary for those frequently exposed. Understanding this threshold is important for anyone working in loud environments, as it helps in implementing appropriate hearing conservation programs.

The other decibel levels listed are not aligned with this critical threshold for an 8-hour exposure. For instance, while a decibel level of 80 is still audible and could contribute to hearing problems with very long exposure times, it is considered safe for more extended periods in most occupational settings. As levels rise, the risk increases significantly, with 90 decibels marked as even more hazardous, often associated with much shorter exposure limits.