ARB Issues Instructions on Reporting CO2 Emissions for MY 2008 and Beyond

29 August 2007

The California Air Resources Board (ARB) issued a “mail-out” to all vehicle and engine manufacturers—whether on- or off-road; light-, medium- or heavy-duty; marine or terrestrial—notifying them of the requirement and procedure to report CO₂ emissions from 2008 and subsequent model year vehicles and engines.

The reporting requirement does not require any additional emissions tests. Typically, CO₂ emissions are measured along with criteria pollutant emissions by the testing facilities and used in the emissions calculations. CO₂ measurements are also the basis for CAFE calculations.

Certifying engine/vehicle manufacturers are now being asked to include the measured carbon dioxide emissions in their California certification applications. The ARB mail-out provides guidance to all manufacturers on how to report the CO₂ numbers.