EWG's review of available scientific data finds that such an increase in fuel ethanol content may involve multiple human health and safety hazards and a risk of increased air pollution. EPA cannot legally grant the waiver because there are far too many unresolved scientific questions about the impacts of E15 on engines, emission systems and air quality.
EWG's review has found that:
- A higher ethanol blend may damage non-road engines and emission control systems.
- Emissions from higher ethanol fuels may worsen health risks from air pollution.
- Extensive distribution of higher-ethanol fuel blends may pose new safety risks and higher fuel costs.
- Higher-ethanol fuel blends may compromise lifetime performance of non-flex fuel vehicles.