![[logo] US EPA](https://webarchive.library.unt.edu/eot2008/20081024061027im_/http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
1999 National-Scale Air Toxics Assessment
- About the Assessment
- Frequent Questions
- 1999 Assessment Results
- Issues in the 1999 National Emissions Inventory
- Emissions Density Maps
- Databases
- Pollutant-Specific Pie Charts
- Results: Emissions
- Modeled Ambient Concentration Maps
- Databases
- Results: Model-to-Monitor Comparison
- The ASPEN Model
- Results: Modeled Ambient Concentrations
- Estimated Risk: Summary of Results
- Estimated Risk: Key Risk Assumptions and Limitations
- Estimated Risk: What About Diesel PM?
- Overview of the Maps
- National-Scale Assessment Results: Risk Maps
- Estimated Risk: Background on Risk Characterization
- Limitations in the 1999 National- Scale Air Toxics Assessment
- Databases
- Glossary of Key Terms
- 177 Pollutants