Determining whether a particular household smell is a genuine natural gas leak involves recognizing its distinct characteristics and associated physical signs. True utility gas has a pungent, unmistakable odor resembling rotten eggs, sulfur, or a skunk spray, which comes from the mercaptan additive mixed into the otherwise odorless fuel. To verify a leak, listen closely near gas lines and appliances for a faint hissing or whistling sound, and look for physical indicators such as bubbling water and soap sprayed onto gas joints, dead or discolored houseplants near gas pipes, or a white dust cloud blowing near a connection. If you notice these signs, never use open flames or light switches; evacuate immediately and call emergency services or your local gas utility provider.
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