Noise Risk Assessment in Malaysia. Base on Occupational Safety and Health (Noise Exposure) Regulation 2019. The NRA Risk Assessor (NRA) is the person responsible for conducting workplace noise exposure assessments as required under the Occupational Safety and Health (Noise) Regulations 2019. An employer must appoint, employ or hire a competent person called the Noise Risk Assessor to carry out a Noise Risk Assessment (NRA) in accordance with the standards set by the Departmen