Study shows how shifting California to E15 could reduce smog

In California, the state took an important step toward approving the use of cleaner, lower-cost E15 by releasing the results of a multi-year study of the fuel’s emissions impacts. The results of the study, which tested 20 vehicles, show that shifting from E10 to E15 reduces emissions of most pollutants that contribute to ozone formation and, ultimately, “smog.” California is one of only two states across the country today that doesn’t currently allow the sale of E15.

“Ozone forming potential showed a decreasing trend for E15 compared to E10, indicating that the introduction of E15 in the California gasoline market will likely not contribute to increases in ozone formation,” according to the study. The report also shows E15 significantly reduces emissions of particulate matter, which is another key ingredient in “smog.” The study, which was conducted by researchers at the University of California-Riverside, was supported by the Renewable Fuels Association, California Air Resources Board (CARB), U.S. Council for Automotive Research, National Corn Growers Association, and Growth Energy.