1. Review existing approaches for modeling air toxics on local,
regional, and national scales,
2. Identify modeling deficiencies and suggest improvements,
3. Identify inconsistencies in the use of results, particularly linkage
with other models (like micro-environment models, and exposure and risk models), and with
monitoring data (where selectively used to imply validation),
4. Scope out a "fresh slate" alternative approach to modeling
air toxics, and
5. Evaluate model performance on selected mobile source air toxics such
as benzene and diesel particulate matter using a state-of-the-art approach.
