National Scale Modeling of Air Toxics for the Final Mobile Source Air Toxics Rule, Technical Support Document

摘要

The purpose of the work described in this technical document was to project emissions for mobile source hazardous air pollutants (HAPs) to 2010, 2015, 2020, and 2030 from the 1999 National Emissions Inventory Version 3 (NEI) (U. S. EPA, 2004a), conduct air quality and exposure modeling, and estimate cancer and non-cancer risk for select future years. Air quality modeling utilized the Assessment System for Population Exposure Nationwide (ASPEN) model (U. S. EPA, 2000). Exposure modeling utilized the Hazardous Air Pollutant Exposure Model, Version 6 (HAPEM6) (U.S. EPA, 2007). Cancer risk and non-cancer risk were estimated for 1999, 2015, 2020, and 2030. Modeling was done for reference cases, which included programs currently planned and in place, as well as control scenarios that evaluated impacts of additional control programs being finalized in this rule. This work was done to support regulatory needs related to the 2007 final mobile source air toxics rule.