A composition comprising natural gas, methane, LPG (liquefied petroleum gas) or propane, and an oxygenate odorant, where the oxygenate odorant has a vapor pressure of about 0.002 psi or greater at 25° C. and 1 atmosphere, and has a smell detectable at less than 1 ppm by a human nose, and where the oxygenate odorant is a cyclic compound consisting only of carbon, hydrogen and oxygen, including one or more carbonyl groups, and is stable under high pressure and temperature storage, transport and use conditions.