Airborne ultrasound could be harmful
<p>A new study suggests exposure to airborne ultrasounds could cause light nausea and sudden headaches.</p>
<p>Published in Proceedings of the Royal Society A, the study finds that the general public are unaware that they are being exposed to very high-frequency (VHF) sound and ultrasound (US) at levels over the current guidelines. A UK research clams that humans should not be exposed to ultrasound greater and 20 kilohertz, which is the heist frequency humans can here. If they are for long periods of time, then symptoms such as dizziness, migraines and tinnitus can also manifest.</p>
<p>There are many examples of sounds that are higher than 20 kHz in public places including loudspeakers, door sensors and public address systems,</p>
<p>Based on these findings, Professor Tim Leighton says further investigation into the potential health implications of airborne ultrasound is warranted.</p>
<p>In particular, he believes studies should assess "whether current audiological practices, equipment and standards are suitable for the VHF and ultrasonic regime," and they should also identify strategies to combat any shortfalls.</p>
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