If you smell natural gas, or if you hear or see signs of a gas leak, DO NOT attept to find the leak yourself. Instead, leave the area immediately and call our emergency number1-800-400-4271 or 911. ... Natural gas is combustible only when it makes up 5-15% of the air in a given space.
What is considered a gas emergency?
We consider all of the below a gas emergency: You smell an odor similar to sulfur or rotten eggs. There is abnormal pressure (high/low flame) or no gas in all your gas appliances. Gas to an appliance or heating unit stays on and cannot be shut off.