New federal standards introduced this year will require diesel-fueled vehicles to meet the same emissions standards as gasoline models. On average, these new criteria call for a 77 percent reduction of NOx emissions and an 88 percent drop in particulate emissions for diesels to be on par with standard gas-engine cars.
Because of the tightened emission standards, several diesel automakers are opting to bow out of the U.S. market, and will not import their new diesel models for 2007. But DaimlerChrysler is planning to release their Jeep Grand Cherokee 3.0-liter, common-railturbodiesel in the first quarter of 2007. Volkwagen (VW) will still offer their V10 TDI Touareg SUV, but will not be sending new diesel Jettas, Golfs, or Beetles to the United States. VW plans to re-engineer engines in 2008 models to meet the stricter U.S. emissions standards. (For a list of new diesel models currently offered or coming soon to the U.S. market, visit the Diesel Technology Forum Web site at
www.dieselforum.org/where-is-diesel/cars-trucks-suvs.) Various studies have compared the emissions of biodiesel, SVO/WVO, and petrodiesel. The EPA reports that, compared to petrodiesel, biodiesel reduces emissions of hydrocarbons, carbon monoxide, and particulate matter.
Test results published in a May 2006 Consumer Reports article reported that biodiesel and SVO also produced fewer particulate emissions, but greater hydrocarbon emissions than petrodiesel. In terms of NOx, biodiesel had the highest emissions, and SVO had the lowest emissions. Most studies agree that burning biofuels does produce fewer health hazards compared to petrodiesel.