Carbon Monoxide Alarms Leading Every Resident To Safety Act of 2019 or the CO ALERTS Act of 2019 This bill requires the installation of carbon monoxide detectors in each unit of specified federally assisted housing, in accordance with certain standards. Specifically, the requirement applies to (1) supportive housing for the elderly and for persons with disabilities, (2) public housing, (3) rental housing for which the owner receives low-income voucher assistance, and (4) certain rural housing. The Department of Housing and Urban Development (HUD) must provide guidance to public housing agencies on how to educate tenants on health hazards in the home. HUD must also report on the inclusion of carbon monoxide detectors in federally assisted housing not covered by the bill.