monoxide detector per floor of the dwelling unit in accordance with standards and criteria acceptable to the Secretary for the protection of occupants in the dwelling unit. . (c) Public and section 8 housing The United States Housing Act of 1937 ( 42 U.S.C. 1437 et seq.) is amended— (1) in section 3(a) ( 42 U.S.C. 1437a(a) ), by adding at the end the following: (8) Carbon monoxide detectors (A) In general Each public housing agency shall ensure, for each dwelling unit in public housing owned or operated by the public housing agency, that not less than 1 carbon monoxide detector is installed per floor in the dwelling unit in accordance with standards and criteria acceptable to the Secretary for the protection of occupants in the dwelling unit. (B) Rehabilitation With respect to public housing for which a public housing agency is undergoing or planning a substantial rehabilitation project, the public housing agency shall ensure that, during that rehabilitation, not less than 1 carbon monoxide detector is installed per floor in each dwelling unit located in that public housing in accordance with standards and criteria acceptable to the Secretary for the protection of occupants in the dwelling unit.