N.C. Gen. Stat. § 95-217

It is the intent of the General Assembly to prescribe this uniform system for the disclosure of information regarding the use or storage of hazardous chemicals. To that end, all units of local government in the State are preempted from exercising their powers to require disclosure, directly or indirectly, of information regarding the use or storage of hazardous chemicals by employers to any members of the public, or to any branch or agent of State or local government in any manner other than as provided for in this Article. This section does not preempt the enforcement of the provisions of any nationally recognized fire code that may be adopted by a unit of local government.