At what sound level in dBA is daily exposure considered unsafe for workers over a period of months?

Daily exposure to sound levels at or above 85 dBA is considered unsafe for workers over extended periods, such as months. At this sound level, there is a significant risk for hearing loss, and occupational safety guidelines indicate implementing hearing conservation programs when noise levels exceed this threshold.

Choosing 90 dBA as the answer reflects an understanding that it is not only an elevated level of sound but also an increased risk factor within occupational settings. Prolonged exposure to sound at this intensity can lead to irreversible damage to the auditory system. The higher the dBA level, the shorter the safe exposure time becomes. For instance, while 85 dBA is the point at which noise regulations often begin to apply, 90 dBA signifies an even greater concern for worker safety and health.

In summary, 90 dBA is recognized as a critical point for initiating protective measures in workplace environments to prevent long-term hearing damage, making it an appropriate selection for defining unsafe daily exposure levels for workers.