Noise pollution
Videos
Noise pollution is sound with potential harmful effects on humans and animals. The main sources of outdoor noise worldwide are machines, transportation, and propagation systems. Poor urban planning ma
A Qantas Boeing 747-400 passes close to houses shortly before landing at London Heathrow Airport.
Traffic is the main source of noise pollution in cities like São Paulo.
Measuring the noise level from a leaf blower using the NIOSH Sound Level Meter app
The CityLink sound tube in Flemington, Melbourne, Australia, is designed to reduce roadway noise without detracting from the area's aesthetics.
Noise
Videos
Noise is sound, chiefly unwanted, unintentional, or harmful sound considered unpleasant, loud, or disruptive to mental or hearing faculties. From a physics standpoint, there is no distinction between
Noise pollution
…average sound level (L_dn) are commonly used in regulatory and public health contexts to describe long-term community noise exposure. Researchers measure noise in terms of pressure, intensity, and frequency. Sound pressure level (SPL) represents the amount of pressure relative to atmospheric pressure during…
NASA researchers at Glenn Research Center measuring aircraft engine noise in 1967
The urban police of Milan while using a noise measurement device for sound level control on city streets in 1955