This project focused on the collection and speciation analysis of PM2.5 aerosol filters at the West Liberty (C699) site operated by the University of Houston. Daily PM2.5 filter samples on quartz and Teflon filters were collected with the University of Nevada – Reno’s Desert Research Institute (DRI) performing speciation on every 3rd day per the EPA sampling schedule. In addition to the standard organic, inorganic, and ion analysis, additional sugar and carbohydrate analyses were performed to identify periods of biomass burning impacts as well as influence from local sources and transport into the HGB area. Additional measurements at West Liberty that were supported by this or other TCEQ funded projects include PM2.5 mass concentration, O3, CO, NO/NOX, and meteorological parameters. The data analysis portion of this study performs source apportionment of the PM2.5 obtained by the filters collected at West Liberty between December 2015 and December 2017 (227 samples, 93.4% of possible samples) using two Factor Analysis (FA) methods, Principal Component Analysis (PCA) and Positive Matrix Factorization (PMF). Seven source categories were identified: crustal, industrial, gasoline combustion, incineration, regional aerosols, marine aerosols, and biomass burning. An eighth factor, fireworks, were apparent at the beginning of 2017. HYSPLIT back trajectories were used to classify air mass source regions for each day during 2016 and 2017. Cluster analysis of these trajectories resulted in five profiles (Gulf of Mexico, Midwest, Pacific Northwest, Southwest, and local/regional recirculation) with only 22 days unclassified. These factors and trajectory clusters show that during summer months marine and crustal sources (Saharan dust) were often associated with an on-shore flow from the Gulf of Mexico, while continental flows brought higher backgrounds of CO, O3, NOX, and PM2.5. The recirculation events were characterized by lighter winds and high afternoon values of O3 and PM2.5. These data can be used to support a variety of scientific and policy relevant investigations regarding the sources of aerosol and trace gases observed at the West Liberty measurement site. Going forward, UH is looking towards an expansion into remote sensing methods at West Liberty to develop retrieval algorithms that can be applied to policy relevant issues such as the routine monitoring of air quality in and around urban areas for both gases and aerosols.