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You cannot measure exactly the sound pressure level of the noise. It will change a bit. You cannot decide the allowable sound pressure level exactly on the minute.
It depeds on the listening person. Some are more sensitive and some are less.
"Permitted Exposure Time Guidelines - SPL"
Sound pressure level Lp and permissible exposure time t:
115 dB = 0.46875 minutes (~30 sec)
112 dB = 0.9375 minutes (~1 min)
109 dB = 1.875 minutes (< 2 min)
106 dB = 3.75 minutes (< 4 min)
103 dB = 7.5 minutes
100 dB = 15 minutes
97 dB = 30 minutes
94 dB = 1 hour XXX
91 dB = 2 hours
88 dB = 4 hours
85 dB = 8 hours
82 dB = 16 hours
Lower dBs are said to be harmless
Accepted standards for recommended permissible exposure time for continuous time weighted average noise, according to NIOSH (National Institute for Occupational Safety and Health) and CDC (Centers for Disease Control and Prevention) in 2002.
For every 3 dBs over 85dB, the permissible exposure time before possible damage can occur is cut in half.
The maximum permissible dose refers to the highest amount of a substance that can be safely consumed or exposed to without causing harmful effects. Understanding how a substance relates to the maximum permissible dose helps determine its safety for use or exposure. If the substance exceeds the maximum permissible dose, it may pose health risks or lead to toxicity.
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