As Swedish cities are densified at a fast pace, there is now construction very close to roads and thoroughfares - land that was considered unthinkable for development just a decade ago. It is already ...

Secondly, while the aircraft is taking off and landing, noise levels measured 100 m (330 ft) from the vertipad stayed below 65 dBA over more than 20 VTOL tests, with the aircraft rising to or ...

So CycloTech stuck a propulsion barrel on a test stand and took a bunch of readings, reporting that "the CycloRotor generates a sound pressure level of 59 dBA at a distance of 100 meters (328 ft), ...

Children, teens and adults unknowingly risk their hearing during many activities. The damage can be immediate and permanent or gradual, causing hearing loss over time from prolonged exposure.