Which of the following is a common sign of a gas leak?

A strong odor of rotten eggs is a common sign of a gas leak because utility companies add an odorant called mercaptan to natural gas, which is normally colorless and odorless. This deliberate addition allows people to detect gas leaks quickly and easily, as the strong and unpleasant smell can prompt immediate action to mitigate any potential danger. Recognizing this distinct odor is critical for safety in homes and businesses that use gas appliances.

Other signs, such as cool air near the appliance, could indicate a variety of issues unrelated to a gas leak, like draft issues or appliance malfunctions. A loud hissing noise might suggest a gas leak but can also indicate normal operational sounds from certain appliances or fittings. A bright blue flame in the burner is actually a sign of proper combustion, indicating that the gas is burning efficiently. Identifying the strong odor of rotten eggs remains the most reliable and immediate alert for gas leaks, ensuring individuals take swift and appropriate action.