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EiceBleu read this :

From: DOE/Argonne National Laboratory

Ethanol Causes Pollution, Too, Argonne Scientists Say

While the use of ethanol as an automobile fuel additive improves air quality by reducing hydrocarbon and carbon monoxide emissions, it also increases the release of certain other pollutants, according to research by scientists at the U.S. Department of Energy's Argonne National Laboratory

A recent field study in Albuquerque, N.M., published this month in Environmental Science & T