If there is a gas smell in the house while you read these lines, leave the premises and call 911 without delay. If not, keep on reading.
In its purest form, natural gas is odourless, but not harmless. For consumer safety and to prevent leaks, organic compounds called thiols or mercaptans are added to the gas. That's what makes the gas smell like rotten eggs. Are you wondering if the additive is toxic? Don’t worry, it’s perfectly safe. The proof? Those famous stink bombs sold in practical joke stores are made with the same smelly substance!