A person will need be continuously exposed to 90 decibels, A-weighted (dBA) over an 8 hour to be in violation of OSHA regulations. NIOSH says 85 dBA over 8 hours but that is still pretty loud as an average.
You can find out for yourself, NIOSH has a free
$1 and it can give you a projected average based on NIOSH and OSHA standards.