Heavy-Duty Diesel Vehicle (HDDV) Idling Activity and Emissions Study: Phase 1—Study Design and Estimation of Magnitude of the Problem

Project Description

Heavy-duty diesel vehicle (HDDV) emissions contribute to the production of NOx, a precursor of ozone formation. The emissions associated with extended idling by HDDVs are not accounted for by current procedures. This emissions source may be significant. The purpose of this analysis was to develop an estimate of the emissions associated with extended idling by HDDVs, propose a study design for accurately quantifying extended truck idling emissions, and propose control procedures or measures to reduce or eliminate these emissions. Researchers found that extended truck idling occurs primarily at the following locations: truck stops, public rest areas, industries, ports, and intermodal facilities. Approximately 23 tons per day of NOx emissions are emitted in the major metropolitan areas in Texas due to extended truck idling. The contribution of the nonattainment and near nonattainment areas is approximately 13 tons per day of NOx emissions. A study design was developed that provides a framework for quantifying extended truck idling emissions in Texas. By implementing the framework in a subsequent phase, the Texas Commission on Environmental Quality (TCEQ) will have a clear understanding of the extent of idling emissions in Texas (current and future), strategies for reducing extended idling emissions, and the cost-effectiveness of applying such strategies.

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