A scheme to track medium- and heavy-duty vehicle emissions has been approved for adoption by the California Air Resources Board (CARB). Real emissions assessment logging (REAL) is an amendment to the On-board Diagnostic Regulations (OBD), which comprise software added to an on-board computer that detects emission control system malfunctions, alerts the driver, and stores information about the problem. The OBS was first introduced in 2005 as a way of reducing tailpipe emissions, but it also allows automakers to monitor their vehicles more closely than they otherwise would be able to.
A scheme to track medium- and heavy-duty vehicle emissions has been approved for adoption by the California Air Resources Board (CARB). Real emissions assessment logging (REAL) is an amendment to the On-board Diagnostic Regulations (OBD), which comprise software added to an on-board computer that detects emission control system malfunctions, alerts the driver, and stores information about the problem. REAL requires OBD systems to gather and store emissions data from nitrogen oxide on medium- and heavy-duty diesel vehicles in-use from the 2022 model year, and to collate fuel consumption data in order to monitor CO2 emissions from heavy-duty vehicles.