Values are what we, as a profession, judge to be right. They are more than words-they are the moral, ethical, and professional attributes of character. . . there are certain core values that must be instilled in members of the U.S. Army-civilian and uniformed soldier alike.
Industrial Hygiene. Noise. Full text of hearing conservation program. Materials on acoustics. Noise attentuation. Noise basics. Technical material from NIOSH. Hearing protection devices. Noise induced hearing loss.
Safeopedia explains Noise Reduction Rating (NRR) Noise Reduction Rating is used to evaluate and determine the effictiveness or fit of noise protection equipment for a given work environment. NRR is specifically the measurement, in decibles, of how well hearing protection reduces noise as specified by the Environmental Protection Agency.