Why does my gas smell like rotten eggs?

If your gas smells like rotten eggs, it's likely due to the presence of hydrogen sulfide, a compound added to natural gas as a safety measure. Natural gas is odorless, so the sulfur-containing compound, usually mercaptan, is added to help detect leaks. A rotten egg smell indicates a potential gas leak, which can be hazardous. If you notice this smell, it's crucial to evacuate the area and contact your gas provider immediately.