N.Y. Comp. Codes R. & Regs. tit. 6, § 225-3.2
(b) For the purpose of this Subpart, the following definitions also apply:
(2) Carbon monoxide (CO). A colorless, odorless, tasteless gas at standard conditions having a molecular composition of one carbon atom and one oxygen atom.
(iii) if an area which was designated as nonattainment is redesignated as attainment for carbon monoxide, that CMSA or MSA as long as is necessary to maintain such standard in that area. The following shall be considered to be carbon monoxide control areas:
(3)