SACRAMENTO, Calif. -- A transit bus equipped with a particulate filter running on low sulfur diesel fuel produced lower emissions than a compressed natural gas bus, according to a study released April 18 by the California Air Resources Board.

MINNEAPOLIS -- A bill requiring diesel fuel sold in the state to contain a 2 percent blend of soy or vegetable oil became law without the governor's signature March 11, making Minnesota the first state to mandate biodiesel in its fuel.

SACRAMENTO, Calif. -- A transit bus equipped with a particulate filter running on low sulfur diesel fuel produced lower emissions than a compressed natural gas bus, according to a study released April 18 by the California Air Resources Board.

WASHINGTON, D.C. -- A federal appeals court rejected attempts May 3 by some engine makers and fuel refiners to squelch the Environmental Protection Agency's 2007 emissions requirements for diesel trucks and buses, adding yet another chapter to the long-running debate over diesel fuel and school buses.

BERKELEY, Calif. -- School buses in all 50 states release toxic air pollutants that are harmful to the health of school children, according to a study conducted by the Union of Concerned Scientists (UCS) on particulate matter, smog-forming pollutant and greenhouse gas emissions.