Workers may want to wear their hearing aids under an earmuff. According to OSHA, hearing aids should not be used in areas with dangerous noise levels. However, OSHA allows for the professional(s) in charge of the hearing loss protection program to decide on a case-by-case basis if a worker can wear their hearing aids under an earmuff in high-level noise environments. Workers are not permitted to wear their hearing aids (even if they are turned off) instead of using HPD. OSHA specifies that hearing aids are not "hearing protectors" and do not attenuate enough sound to be used instead of HPD. Wearing hearing aids alone, without the use of earmuffs, could potentially cause additional noise-induced hearing loss. It is recommended that workers should not use their hearing aids without the use of an earmuff when exposed to sound levels over 80 dBA.