White noise refers to a noise that contains all frequencies across the spectrum of audible sound in equal measure. Because white noise spans multiple bands of sound, it is sometimes referred to as broadband noise. Just for your information, noise at 70 dB level is similar to the sound of a moving car 10 meters away. Noise at this level was reported to be just soothing enough to calm our minds and keep ambient sounds away, with itself not being too overwhelming to distract us from our tasks . With the development of urbanization, road traffic noise has become the main source of urban noise pollution, accounting for 60-80% [].Noise exceeding 50 dB affects sleep and rest, noise exceeding 70 dB triggers psychological stress and distraction, and living for a long time in a noise environment of more than 90 dB can seriously damage hearing and induce other health problems []. Another reason why white noise promotes sleep lies in the nature of our brain: it thrives on stimulation. Nightly noises tend to activate our brain, disrupting our rest. A consistent white noise serves as a satisfying stimulus, preventing overexcitement when sudden sounds occur at night. The threshold of human hearing is typically around 0 dB, while normal conversation levels usually fall within a range of 50-65 dB. When it comes to white noise, setting the volume between 50 and 70 dB is recommended for most users. The ideal dB level for white noise will vary depending on individual preferences and reactions to different volumes. White noise is us hearing all frequencies at the same time. And the same goes for pink noise, brown noise, and all other colored noises too. It also applies to sound masking, a specially engineered noise used to even out the soundscape of uncomfortably quiet offices and improve the acoustic privacy of employees. A noise level chart showing examples of sounds with dB levels ranging from 0 to 180 decibels. As a frame of reference, here are the decibel levels of sounds you may encounter in your everyday life. 0-30 dB, Very Faint. One-sixteenth as loud as 70 dB. Very Quiet. Noise above 70 decibels can cause hearing damage when listened to for an extended period. Keep your white, pink, or brown noise well below 45 decibels. If this needs to be adjusted for different noise conditions, avoid exceeding 70 decibels (dB), particularly for an extended period. The white noise model can be used to represent the nature of noise in a data set. For time series data, auto-correlation plots and the Ljung-Box test are two ways to test for white noise. Different organizations suggest different volume levels for white noise depending on usage context. For example, the American Academy of Pediatrics (AAP) recommends a general maximum white noise volume of 50 A-weighted decibels (dBA), while the World Health Organization (WHO) suggests an even lower limit of 30 dBA for hospital nurseries. 6PVU.