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Loud noise exceeding levels that can damage hearing is regularly encountered by commuters using buses, subways and even biking, a Canadian study suggests.
Sound levels as low as 40 dB(A) can generate noise complaints [43] and the lower threshold for noise producing sleep disturbance is 45 dB(A) or lower. [ 44 ] Other factors that affect the annoyance level of sound include beliefs about noise prevention and the importance of the noise source, and annoyance at the cause (i.e., non-noise related ...
The L90 is the sound level that exceeds 90% of the time period; this is commonly referred to as background noise. [12] Researchers with the US National Park Service found that human activity doubles the background-noise levels in 63 percent of protected spaces like national parks, and increases them tenfold in 21 percent.
Metabolic health: If it goes on long enough, the uptick in blood sugar caused by the body’s stress response to noise can contribute to insulin resistance (a precursor to type 2 diabetes) and ...
A substantial part of this noise results from the use of power tools, which can produce dangerous levels of noise by themselves. [6] Although the loudness of power tools may be quite apparent to those using them, the actual level of noise produced was mostly unreported and not available easily in an online reference.
Once exposure to damaging noise levels is discontinued, further significant progression of hearing loss stops. Individual susceptibility to noise-induced hearing loss varies greatly, but the reason that some people are more resistant to it while others are susceptible is not well understood. [7]
A study of occupational and recreational noise exposure at indoor hockey arenas found noise levels from 81 dBA to 97 dBA, with peak sound pressure levels ranging from 105 dB SPLto 124 dB SPL. [75] Another study examined the hearing threshold of hockey officials and found mean noise exposures of 93 dBA.
Note that for some people, sound may be damaging at even lower levels than 85 dB A. Exposures to other ototoxicants (such as pesticides, some medications including chemotherapy agents, solvents, etc.) can lead to greater susceptibility to noise damage, as well as causing its own damage. This is called a synergistic interaction. Since noise ...