CARB releases E15 emissions study

The California Air Resources Board on July 15 released the results of a multi-year study on the emissions impact of E15. The study highlights the air quantity benefits that could be achieved by adopting the use of E15 within the state.

The study found that E15, when compared to E10, achieved statistically significant particular matter (PM) reductions of 16-54 percent across the fleet of 20 vehicles. Solid partial number emissions were 12 percent lower for E15. Total hydrocarbon missions were also reduced 5-6 percent for E15. For non-methane hydrocarbon emissions, E15 achieved a 7-15 percent reduction when compared to E10. E15 also resulted in 12-27 percent reduction in carbon monoxide emissions. Weighted carbon dioxide emissions were 17 percent lower across the fleet of 20 vehicles. The study also indicates that E15 caused only a 1 percent reduction in fuel economy.

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