Carbon monoxide kills about 40 people in California every year, according to the California Air Resources Board. Single-family homes were required to have carbon monoxide detectors installed by July 1, 2012 and multifamily buildings have until Jan. 1, 2013, according to the Carbon Monoxide Poisoning Prevention Act. If you haven’t already done so, it’s time to install carbon monoxide detectors on each floor of your home and inside each bedroom.