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# Risk Assessment and Modeling - Air Toxics Risk Asse ssment Reference Library EPA is developing an air to xics risk assessment (ATRA) reference library for conducting air toxics analyses at the facility and community-scale. This library provides information on the fundamental principles of risk-based assessment for air toxics and how to apply those prin ciples in diffe rent settings as well as strategies for reducing risk at the local level. A more detailed descripti on of each volume of the ATRA library is provided below.
Volume 1: Technical Resource Manual
Volume 1 discusses the overall air toxics risk a ssessment process and the basic technical tools needed to perform these analyses. The manual, which covers both human health and ecological analysis, also pro vides a basic overview of risk management and communication. Other tools (such as the public health assessmen t process) are described to give assessors, risk managers, and other stakeholders a more ho listic understanding of the many issues that may come into play during air toxics risk assessment and reduction projects. Volume 2: Facility

- Specific Assessment Volume 2 builds on the technical tools described in Volume 1 by providing detailed procedures for source-specific or facility-spe cific risk assessments. Information is also provided on tiered approaches to sour ce- or facility-specific risk analysis. Volume 3: Community

- Scale Assessment Volume 3 builds on the information presented in Volume 1 to describe how to evaluate and reduce cumulative air toxics risks at the local level. Th e volume also discusses other multimedia risk factors that ma y affect communities, and strategi es to reduce those risks. Community Air Screening How

- To Manual The Community Air Screening How-To Manual pr ovides a detailed step-by-by step guide to help community partnerships use one of the sc reening level approaches described in Volume 3 to understand and improve local outdoor air quality. The Manual explains how to form a partnership, clarify goals, develop a detailed source inventory, use a risk-based screening process to identify priorities, and develop option s for reducing risks from priority sources and concentrations. The Manual provides a framewor k for bringing together technical staff and local residents to share information, deliber ate, and build consensu s on priorities for Risk Assessment and Modeling General Information Air Toxics Risk Assessment Criteria Air Pollutant Risk Assessment Links to EPA Risk Assessment Policy, Guidelines, and Related Materials 

## Technology Transfer Network FERA (Fate, Exposure, and Risk Analysis) file://rtifile02/ehe/ Projects/0213199-EPA_SPPD_(Base)/0213199.000.003- Pulp_Paper/Technical_R ecord/Dockets/Sector% 20EPA-HQ-OAR-2007-0544/Prom ulgation/Ready%20to% 20u p load/040_Air_Toxics_Risk_Asst_Ref_Librar y .mht Last u p dated on Frida y, Jul y 20 , 2012 

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...improving local air quality. The Manual places special emphasis on sharing information and providing the background educatio n needed to insure that all members of the partnership can participate fully in key partnership decisions. The ATRA library is an ongoing endeavor and may be revised periodically. EPA welcomes public input on the library at any time . Comments may be sent to Dr. Roy Smith (smith.roy@epa.gov ) or Dr. Kenneth Mitchell (mitchell.ken@epa.gov ). 

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