Science Daily: An engine design appearing under the hoods of many new cars and light trucks today is close to meeting the latest pollution standards that will require vehicles to emit fewer harmful particles over their lifetimes, scientists are reporting. The new study on emissions from gasoline direct injection (GDI) technology appears in the ACS journal Environmental Science & Technology. Matti Maricq and colleagues explain that to meet new regulations, vehicle manufacturers need to make cars both more fuel-efficient...