If You Smell Gas Natural gas has no odor of its own, so we inject it with mercaptan, which produces a distinctly unpleasant smell similar to rotten eggs. This makes it easy for you to detect even the smallest leak. Do not use the telephone, do not turn light switches on or off, and do not light matches. Leave the house. Call PNM Gas Services immediately from the nearest phone.
Carbon monoxide is odorless, colorless, and tasteless, but it can cause illness and even death.
The first symptoms are flu-like headaches, nausea, drowsiness, or ringing in the ears. Be suspicious if these symptoms are present in the entire family simultaneously or only when you're at home. A luminescent yellow flame instead of a bright blue one. Corrosion on vent piping. Soot around your furnace or water heater pilot lights.