Tennessee Wastewater Operator Practice Exam

What is the danger level, as defined by federal regulations, for individuals whose normal noise exposure might equal or exceed this dangerous level?

1. 8 hour (TWA) of 75 decibels

2. 8 hour (TWA) of 80 decibels

3. 8 hour (TWA) of 85 decibels

4. 8 hour (TWA) of 90 decibels

The correct answer is: 8 hour (TWA) of 85 decibels

The determination of the danger level for noise exposure, as defined by federal regulations, identifies an 8-hour time-weighted average (TWA) of 85 decibels as the threshold that can lead to hearing damage. Exposure at or above this level requires employers to implement hearing conservation programs to protect workers' hearing health. The recognition of this 85 dB TWA standard is rooted in occupational safety guidelines, which are designed to mitigate the risk of noise-induced hearing loss. In contrast, levels below this specified limit, such as 75 or 80 decibels, are generally considered to be safe for continual exposure without significant risk. Similarly, while 90 decibels signifies concern for immediate action, it is the 85 decibels that acts as the established cutoff point initiating regulatory requirements and protective measures for employees. Therefore, option C accurately reflects the threshold that necessitates attention and response according to federal standards.