Carbon monoxide is a colorless, odorless gas produced by incomplete combustion of fuels like gasoline. Power tools that run on gasoline can produce carbon monoxide, posing a safety hazard especially indoors. To prevent carbon monoxide poisoning from power tools, operators must ensure adequate ventilation when using tools, store power tools properly in specialized cabinets, and be aware of symptoms like headaches and nausea that could indicate exposure to carbon monoxide.