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(dB) measures sound intensity level. ➤0 dB is barely audible sound. ➤Normal conversation is 60 dB. ➤Sounds above 85 dB harmful. ➤WHO limit: 55 dB daytime. ➤WHO night limit: 40 dB. ➤Airports often exceed 100 dB. ➤Headphones can reach 110 dB. ➤dB scale is logarithmic, not linear. ➤Prolonged 70+ dB causes hearing damage.
