EPA is proposing, at the request of the State of Maine, to require the sale of reformulated gasoline (RFG) in York, Cumberland, Sagadahoc, Androscoggin, Kennebec, Knox and Lincoln counties in southern Maine starting in June 2015. RFG is required in cities with high smog levels and is optional elsewhere. RFG is currently used in 17 states and the District of Columbia. About 30% of gasoline sold in the US is reformulated.
The purpose of the federal RFG program is to improve air quality in certain areas through the use of gasoline that is reformulated to reduce motor vehicle emissions that lead to the formation of ground-level ozone. Ground-level ozone can cause breathing problems, aggravate asthma and other pre-existing lung diseases, and make people more susceptible to respiratory infection.
States which are designated by EPA as part of the Ozone Transport Region, such as Maine, can “opt-in” to the program.