Ohio Rev. Code Ann. § 3710.02
(A) In accordance with Chapter 119. of the Revised Code, the director of environmental protection shall, as the director determines necessary, adopt rules to carry out this chapter. The rules shall include all of the following:
(10)
(a) Subject to the condition specified in division (A)(10)(b) of this section, a standard requiring that the amount of asbestos contained in the air in areas accessible to the public in buildings that are owned, operated, or leased by a public entity be not more than ten thousand asbestos fibers longer than five microns per cubic meter of air calculated as an eight-hour time-weighted average, which is measured during periods of normal building occupancy, and a requirement that measurement of airborne asbestos be made by either or both of the following methods, provided that results derived by use of the method described in division (A)(10)(a)(i) of this section supersede results derived by use of the method described in division (A)(10)(a)(ii) of this section if both methods are used and the methods yield conflicting results concerning the presence of fibers in the tested air that may not be asbestos:
(B) The director shall do all of the following: