Who can carry out a noise survey?

Who exactly has the capability and qualifications to undertake a noise survey? Is it a job reserved for specialized acoustical engineers or can it be performed by anyone with a basic understanding of sound levels? Are there any legal requirements or certifications that one must possess in order to conduct such a survey? Additionally, how does one go about acquiring the necessary knowledge and skills to carry out a noise survey? Lastly, what are the potential consequences of conducting a noise survey without the proper qualifications or expertise?