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The frequency range of 2000 to 4000 hertz is identified as the most hazardous to hearing because it encompasses frequencies where human speech primarily resides and where the ear is most sensitive to sound. Extended exposure to noise within this range can lead to various forms of hearing damage, including noise-induced hearing loss. This frequency range also coincides with many environmental and occupational noise sources, making it not only a significant concern for auditory health but also pertinent for industrial hygiene practices.

Additionally, research has shown that sounds in this frequency range can cause more strain and damage to the hair cells within the cochlea, which can ultimately result in threshold shifts in hearing sensitivity. Understanding the specific dangers associated with various frequency ranges is crucial for developing effective hearing conservation programs and for implementing appropriate noise control measures in workplaces.