# Engines and Exhaust Aftertreatment

To meet requirements for improved efficiency and reduced emissions, a large number of new vehicle fuels and technologies are being developed. Although there is opportunity for major progress, HEI is interested in identifying any potential unintended health consequences from such developments. HEI’s Communication 16The Future of Vehicle Fuels and Technologies: Anticipating Health Benefits and Challenges, published by the Scientific Committee on Emerging Technologies (SCET) in 2011, provides a comprehensive perspective on these issues.