Leave, then call 911 or pse natural gas is colorless and odorless in its natural state An odorant called mercaptan is added to give it a sulfur or rotten egg smell to help detect a leak Because it’s lighter than air, natural gas will rise and disperse if allowed to vent freely. Report a gas emergency leave the area before calling if you suspect a gas leak, leave the area immediately Never use devices that can generate a spark, such as a light switch, garage door opener or a land line, near a gas leak A puget sound energy (pse) employee reported a broken and blowing gas line at 10:17 a.m
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