Survey 360 Pro

Riyadh metro door open sound more then 97 db someone have to notice
Normal human can listen 80 db for 8 hrs
Every 3db the time will reduce to half
Means 83 db for 4 hrs
86 db for 2 hrs
89 db for 1 hrs
92 db half 95 for 15 minutes
It means if someone use metro he never have to listen anything els
Otherwise he could face different physical and psychological problems
It’s not good for heart patients
Check Wikipedia for sound pollution

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