Woman pumping gas

Gasoline storage and dispensing operations at retail service stations and private facilities release ROG vapors containing listed substances into the atmosphere. These emissions occur during underground storage tank loading, tank breathing, spillage, and vehicle refueling. Emission rates are highly dependent upon the installation and performance of Phase I and Phase II vapor recovery equipment. The primary components of gasoline vapor are benzene, hexane, toluene, xylenes, and a mixture of other nonmethane hydrocarbons. Actual vapor concentrations of each component will vary depending upon the composition and temperature of the gasoline.