1. The conventional Occupational Exposure Limits (OEL)/Permissible Exposure Limits (PEL)/Threshold Limit Values (TLV) are developed for exposures at normal pressure (1 atm absolute) and temperature (25°C). Are the conventional OEL/PEL/TLV

for toxic gases/vapors and aerosols applicable to hyperbaric work at elevated pressure such as that experienced during compressed air tunnelling work where the absolute pressure in working chambers is usually between 2 and 3 atm (or bar). You should provide logical/ scientific basis (such as the relevant gas laws) for your reasoning.