What is the natural liquified gas specification?
Is this what you meant? Natural gas is mostly composed of methane (CH4) which makes up about 90 to 95% of the gas. The remaining 5 to 10% of the gas is mostly carbon monoxide and hydrogen sulfide. The carbon monoxide is naturally present along with the methane and is in low enough concentration to safely have it in the fuel. However the hydrogen sulfide was added to the gas to give it an odor in order for people to detect dangerous leaks.