A review of current airborne ultrasound exposure limits

Abstract

Research has indicated that airbourne ultrasound impinging on the eardrums of humans has the potential to cause undesirable effects. This article reviews current recommended airbourne ultrasound exposure limits from standards organisations around the world. As there is a general consensus among standards organisations with regard to these exposure limits, it is recommended that sound pressure levels should be less than 110 dB above 25 kHz, regardless of the exposure duration, to prevent the undesirable subjective effects of ultrasound.