EU-Law requires the employer to supply noise protection equipment to the employee when the average SPL is >80 dB (A) over 8 hours. Over >85 dB (A) the use of such equipment is mandatory.
I stand to be corrected, but am quite certain that this does not apply to transport workers. I value my hearing, so bought the best ANR headset money could buy and wear it from pushback to parking brake set!