I can smell gas – what should I do? What to do if you smell gas If you smell gas or fumes - call the National Gas Emergency service immediately on 0800 111 999. They operate 24 hours a day, 52 weeks a year. Turn the gas off at the meter. Open all doors and windows. Don’t use electrical switches or naked flames. Keep people away from the area. Keywords gas ; emergency Related links Gas Safety and Servicing Information National Grid – emergency information