N.Y.C. Admin. Code § 24-106: § 24-106 Investigations and studies by commissioner.

The commissioner may make or cause to be made any investigation or study that in his or her opinion is desirable for the purpose of enforcing this code or controlling or reducing the amount or kind of air contaminants. For such purposes, the commissioner may make tests, conduct hearings, compel the attendance of witnesses, and take their testimony under oath and may compel the production of books, papers and other things reasonably necessary to the matter under consideration.