Ontario Office of the Fire Marshal (OFM) Firefighter II Certification Practice Exam

Carbon monoxide detectors are commonly found in homes due to the highly toxic nature of carbon monoxide (CO) and its prevalence as a byproduct of incomplete combustion in heating systems, stoves, and fireplaces. Since carbon monoxide is odorless, colorless, and tasteless, it poses significant risks to residents, making early detection essential for safety. The installation of carbon monoxide detectors is often mandated by building codes in many regions, including Ontario.

Oxygen detectors, while important in certain environments, are not typically necessary in home settings where air quality is usually sufficient. Methane detectors are more specialized and are generally used in contexts where natural gas is utilized, like in gas appliances. Radon, a radioactive gas that can enter homes through the ground, has its own monitoring devices but is less commonly associated with immediate risks compared to carbon monoxide, thus not typically found as a standard home safety feature.