New Delhi: Places like railway station, museums, sports stadium, libraries, schools has higher expose to airborne ultrasound which can lead to diseases like nausea, dizziness, migraine, fatigue and tinnitus.

According to the university of Southampton, people are being exposed to airborne ultrasound without their knowledge in public places. Loudspeakers, door sensors, public addressing system can generate airborne ultrasound in public places.

Professor Tim Leighton collected readings of very high frequency/ultrasonic VHF/US fields in several public buildings using smartphones and tablets equipped with an app. The findings were then calibrated with two or three independent microphone and audio data systems.

Study author Professor Tim Leighton found that members of the public were exposed to VHF/US levels over 20 kHz, which is the threshold of the current guidelines.

People who are unaware of this airborne exposure are complaining, for themselves and their children.

One in 20 people between the age of 40-49 years is suffering from hearing threshold that is a minimum of 20(DB) which becomes more sensitive at 20KH than that of people aged between 30-39.

Five percent of the People between the age of 5-19 are likely to have 20KH threshold that of 60(DB) more sensitive than the median for the 30-39 year age group.

The current reports are not capable for fighting with the mass exposure, which a large number of people is facing. Current guidelines are not meeting the requirements for such a large public who is being exposed to airborne ultrasound. These guidelines are roughly collected on the basis of small groups' mainly male adults.

Over a period of time, many workers are being exposed to occupational industrial ultrasound through industrial devices for cleaning and drilling which affects them negatively.

It's very much necessary that suffers can able to identify whether they are suffering from VHF/US exposure or not. The lack of research states that it is not possible to prove or disprove the health risk of public.(IANS)(Image-huffingtonpost)