Jon Said:

What are the health and safety regulations with regard to the environment?

We Answered:

"the environment" covers a vast array of things.

Any 'elf 'n' safety regs basically state that you are to inspect and document any "risks" and to mitigate those risks where possible.
There are specific requirements but these depends on hundreds of different things like who will be there, what jobs, what sort of building/environment etc etc.

Your question is virtually impossible to answer without more information.