Requirements and laws for carbon monoxide detectors differ from state to state. NCSL table summarizes state CO detector regulations.
Letting agents urged to familiarise themselves with new rules coming in next month - Property Industry Eye
HPD Carbon Monoxide Detector Notice
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Carbon Monoxide Laws
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Carbon monoxide detector installation notice(pdf file)
New smoke and fire alarm regulations 2022 – RDM Electrical (Scotland) Ltd.
Smoke and carbon monoxide alarms compulsory from 1 October
Landlords, Smoke alarms and Carbon Monoxide detectors: Whose Job Is It To Change The Batteries?