Emergency lines are available 24 hours a day. Do not assume someone else will report the leak. If you suspect a natural gas leak, leave the area immediately
#1 Thing Atmos instructed for a gas leak! (Surprised me) - YouTube
Never try to find the source of a gas leak
Do not use a mobile phone or anything that might cause a spark, such as a generator.
Atmos energy will send a trained technician immediately to investigate at no cost
