NRC study finds little benefit from oxygenates

A National Research Council panel has concluded that the two principal types of oxygen additives used in reformulated gasolines (RFG) in the U.S. contribute little to reducing ozone pollution. The NRC study examined the differences between the additives ethanol and methyl tertiary butyl ether (MTBE) and concluded that RFG made with ethanol is less effective but that the overall effect of either oxygen additive on reducing ozone (a major component of smog) is very small. William Chameides, study committee chairman, said, "Motor-vehicle emissions of chemicals that form ozone pollution have decreased in recent years. But that's largely because of better emissions control eq...

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