Public hearing for NOx software updates announced

| 9/9/2003

The California Air Resources Board will discuss its proposed heavy-duty diesel engine software upgrade regulation during a public hearing scheduled for 9 a.m. Oct. 23 at the ARB offices in Sacramento, CA, the board announced recently.

The proposed software upgrade regulation requires installation of software to reduce emissions of oxides of nitrogen (NOx) in heavy-duty vehicles from 1993-1999 model years.

The software upgrades, referred to as low NOx software, were developed in the 1990s as a result of negotiations between the U.S. Environmental Protection Agency, the ARM and seven engine manufacturers. Owners of eligible vehicles are both responsible for installing upgraded software under the proposed regulation. In addition, dealers who sell used trucks covered under the regulation must also install the upgrade.

The ARB notice says the meeting could continue on through Oct. 24. To read the complete public hearing notice, go to