Yes the process of measuring the air to determine whether hazardous agents are present, and if so how much, and of measuring noise in a workplace, are both parts of industrial hygiene.
It should only be capitalized if it forms part of a title.
The word "noise" can be a noun.
No, plants do not make noise as part of their natural processes.
soap
Covering your mouth while coughing.
The part of the brain called the Cnifiliatispin controls all testing of heat conditions.
Testing a specific part of a system or even a program. That would be called a component. So it is component testing.
Experimentation.
it depends on your hygiene specifics. If you mean is there a law requiring it, then no, there isn't. However, it is a routine part of some hygiene specifics.
...what?
yes
No. It was part of the second.