Measurement and Estimation of Particulate Matter Concentration on Highways in Southern California. Characterization of Diesel Emissions Using In-door Smog Chamber

This study will further explore the connection between the measurement-based approach for in-/near-source particulate matter (PM) concentration assessment and model-based approach for on-road PM emissions assessment in Southern California; and identify the key traffic-related factors and their impacts on in-/near-source PM concentration. This project will build a mobile monitoring platform (on a probe vehicle) to collect on-road PM concentration data, and developed a comprehensive database to fuse information from various sources (including probe vehicle activity, traffic conditions, PM concentration measurement and PM emissions inventory) for modeling and analysis purpose. The project will develop an integrated database by fusing a variety of data sources. Based on the archived data, the project will investigate the relationship between traffic conditions and highway PM concentration. The proposed innovative tool, so-called PM Emissions Contour plot which can provide more in-depth insight for assessing in-source PM emissions (e.g., on highways). The second part of this proposal is to study fuel effects on secondary organic aerosol formation (SOA). Biodiesel will be chosen as one of the fuel source because it is a sustainable, renewable, and cleaner emission energy source. As a result, there has been a steady increase of interest in using blended petrodiesel and biodiesel. However, there is a lack of studies to explain its SOA formation potential and contribution to the overall air pollution. Therefore, it is important to investigate and study the fuel effects on SOA in the battle to reduce air pollution.