Diesel emissions regulations that require equipment owners to clean up the exhaust stacks of their existing fleet are not coming — they're here. Firms that don't start investigating options now will ...

The increasing market acceptance of advanced clean diesel technology heavy-duty trucks and passenger vehicles will play a major role in helping California achieve future fuel savings and climate ...

In a move being hailed as one of the most significant clean-air upgrades since lead was removed from gasoline decades ago, a new blend of ultra-low-sulfur diesel fuel is on its way to pumps in the ...