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CARB will host a seminar for a research study measuring light-duty vehicle exhaust emissions using roadside-deployed remote sensing devices at eight California locations. The seminar will also discuss the results of using these measurements and other relevant data to analyze several policy-relevant topics, including long-term vehicle emission trends and emission characteristics disparities for communities of different socioeconomic status.
Date: Wednesday, April 30, 2025
Time: 10:00 a.m. – 12:00 p.m.
Location: Webinar
Please register for the workshop. After registering, you will receive a confirmation email with information about how to join the webinar by computer or telephone.
Background
Light-duty vehicles (LDV) continue to be a major source of nitrogen oxides (NOx) and reactive organic gases (ROG) emissions in California, contributing to air pollution at both community and regional levels. Between 1999 and 2018, CARB and partner organizations have sponsored studies to measure LDV exhaust emissions using a remote sensing device (RSD) at a West Los Angeles roadside location. The longitudinal data showed that the LDV fleet had generally become cleaner in real-world driving over the years. The data also suggested significant emission rate disparities between vehicles registered in socioeconomically disadvantaged communities (DAC) and those registered in non-disadvantaged communities in the Los Angeles area.
In order to continue tracking the progress of CARB’s air quality programs and policies and to inform their future potential updates, CARB needs a substantial set of vehicle emissions data throughout California, especially those reflecting real-world driving conditions such as RSD measurements. This seminar discusses CARB’s most recent study measuring exhaust carbon monoxide (CO), hydrocarbons (HC), and NOx emission rates from LDV and heavy-duty vehicles (HDV) with downdraft exhaust tailpipes at eight (8) California locations. The seminar will evaluate trends in LDV emission rates, the emission rate disparities for vehicles registered in DAC and non-DAC, the prevalence of electric vehicles registered in those communities, emission rates for vehicles crossing the U.S.-Mexico border, HDV emission rates, and Smog Check Program attributes.
For more information about this research project, visit the project’s webpage. The project webpage will host the final report and seminar recording once they become available. For more information about CARB’s Research Program, visit our website or email us directly with any questions or comments at research@arb.ca.gov. The final report is available to view or download on the project webpage. The seminar recording will also be posted to the project webpage one to two weeks after the seminar.
Biography
Mr. Alan Stanard is a Staff Engineer at Eastern Research Group (ERG) with a focus on in-use vehicle and engine operation and emissions testing of internal combustion engines and vehicles. In this capacity, he has worked with laboratory and field emissions measurements of light- and heavy-duty vehicles. Mr. Stanard has managed and participated in emissions research projects to measure and characterize gaseous emissions from exhaust and evaporative systems, unregulated emissions, and particulate matter emissions from gasoline and diesel engines as well as light-duty vehicle brake systems. Mr. Stanard has also participated in numerous portable emission measurement system (PEMS) measurements and evaluations. Many of these research projects were conducted in support of informing vehicle emissions inventory models such as US EPA’s Motor Vehicle Emissions Simulator (MOVES) and California Air Resources Board’s Emission Factor (EMFAC) model. Prior to joining ERG, Mr. Stanard was a Project Manager as Southwest Research Institute responsible for projects involving exhaust emissions testing of light-duty gasoline and diesel vehicles. Mr. Stanard has been a presenter at multiple Coordinating Research Council’s Real World Emissions conferences and his work has been published in multiple SAE journal articles.
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