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NARSTO Workshop on Innovative Methods for Emission Inventory Development and Evaluation University of Texas, Austin October 14-17, 2003 |
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Poster 26: St. Louis Community Air Project (CAP) Toxics Emission Inventory Development
Mollie Freebairn
Missouri Department of Natural Resources
An innovative, community-based environmental protection project is taking place in St. Louis, to investigate toxic air pollution, and inform and enable city residents and businesses to address the problems that are found. As part of this project, ambient air monitoring of about 90 toxic pollutants has been done, health benchmarks for many of them have been determined, and a toxics emission inventory has been developed. The inventory covers point, area, and on- and offroad mobile sources in the City of St. Louis. Point source toxic emissions were obtained from Emission Inventory Questionnaires (EIQs), and quality controlled such as by comparing and reconciling differences with the Toxics Release Inventory (TRI). Area source toxic emissions were obtained from the 1996 National Toxics Inventory (NTI), and an analysis has been made of their accuracy. Plans for a local bottoms-up area source inventory were also prepared, but found to be too resource intensive to carry out. Onroad mobile modeling and speciation for toxics was conducted first using MOBILE5b, and most recently the latest draft of MOBILE6.2. Offroad mobile emissions were obtained from the 1996 NTI. An analysis of the strengths and errors in the inventory is given. Monitoring found the highest levels of formaldehyde in any city to date. Current efforts to refine the emission inventory and include biogenic sources to account for the high formaldehyde levels are described.