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Overview

The RFP calls for diverse expertise in vehicle emissions, real time particle measurement, filter sampling, source apportionment, and dispersion modeling. The main aim of this project is to understand chemical and physical nature of non-exhaust PM specifically brake and tire wear PM in the real-world measurement in comparison to well-controlled laboratory characterization. The team, composed of five leading experts, aims to tackle a multitude of questions regarding brake and tire wear PM. A literature survey will be conducted to identify knowledge gap in estimating real-world tire and brake wear PM contributions. Measurements will be conducted at two roadside locations representing light and heavy duty vehicle corridors, respectively. Particle size distribution, mass concentration and elemental composition will be acquired in real-time, and filter samples will be collected for detailed characterization of PM composition. Road dust, tire wear, and brake wear PM samples will be obtained to derive source profiles. Detailed traffic information analysis will be conducted to translate traffic information into the composition of vehicles and brake activities. A novel hybrid environment receptor model with combined benefits of positive matrix factorization (PMF) and effective variance chemical mass balance (EV-CMB) models will be used to apportion measured concentrations to contributing sources, including tire and brake wear PM. Emissions factors will be determined based on carbon balance and distance traveled. Detailed dispersion modeling will be performed to assess impact of brake and tire wear PM to nearby downwind communities.

Lead Researchers: Dr. Heejung Jung Co-researcher: Guoyuan Wu

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