The answer to 'which is better carbon monoxide detector or' is that a carbon monoxide (CO) detector is generally better than a smoke detector for detecting dangerous levels of carbon monoxide in the home. Carbon monoxide is an odorless, colorless gas that can be deadly, and CO detectors are specifically designed to alert you when CO levels become hazardous.
CO detectors are more sensitive to carbon monoxide than smoke detectors, which are primarily designed to detect smoke from fires. CO detectors also have different features that make them more effective, such as digital displays that show the current CO level, and the ability to alert you when levels are rising over time. Additionally, CO detectors are required by building codes in many areas, while smoke detectors are more of a standard safety feature.