## 2005 National-Scale Air Toxics Assessment I Technology Transfer Network Air Toxics ... Page 1 of 1

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## tionaR-Scaie Air Toxics Assessment

You are here: EPA_ Home Air & Radiation TTN Web - Technolo gy Transfer Network Air Toxics Web site National-Scale Air Toxics Assessments 2005 National-Scale Air Toxics Assessment


# 2005 National-Scale Air Toxics Assessment
In 2011, EPA released the results of its 2005 national-scale assessment (NATA) of air toxic 

### emissions. The purpose of NATA is to identify and prioritize air toxics, emission source type, and locations that are of greatest potential concern in terms of contributing to population risk. EPA uses the results of these assessments in many ways, including: • To work with communities in designing their own local-scale assessments, • To set priorities for improving data in emissions inventories, and • To help direct priorities for expanding and improving the network of air toxics monitoring. The 2005 NATA provides information on 177 of the 187 Clean Air Act ai 

### _r toxics _(PDFj (3pp, l5k) plus diesel particulate 

### matter (diesel PM was assessed for noncancer only). The assessment includes four steps that focus on the 2005 emissions year• 2005 NATA Maps • Cancer Map 1 by Tract • Cancer Map 2 by Tract ° Respiratory Map 1 by Tract

~ Respiratory Map 2 by Tract a Instructions for downloading and using Google Earth Maps 

### Announcement The NATA 2005 assessment includes a Technical Methods Document (TMD). This document presents more details on the sources of data, methods, models, and assumptions used than is available on this website. NATA pesources

• USEPA Region 1 • USEPA Region 2 1. Compiling a national emissions inventory of air toxics • USEPA MyEnvironment emissions from outdoor sources • Community-Focused 

### 2. Estimating ambient and exposure concentrations of Exposure and Risk air toxics across the United States Screening Tool (C

- FERST) 

### 3. Estimating population exposures across the United ° E]View 

## States 4. Characterizing potential public health risk due to inhalation of air toxics including both cancer and noncancer effects For information summarizing the 2005 assessment, see the Fact Sheet 

### and Summa 

### rx of Resuits (PDF format,0.48 MB). The Summary of Results document also provides national maps of cancer and noncancer effects such as in the text box to the right. As part of EPA's National Air Toxics Assessment activities, EPA conducted its first nationalscale as 

### s essme 

### nt ( NATA) for 1996 

### . That assessment included 32 air toxics on the Clean Air Act's list of 187 air toxics plus diesel PM (noncancer results only). In February of 2006, EPA released the second of its NATA assessments 

### . This assessment was based on emissions from the 1999 National Emission Inventory and included results for 177 air toxics plus diesel PM (noncancer results only). In June of 2009, EPA released its thi rd NATA, 

### which was based on emissions estimated for 2002. This assessment included results for 180 air toxics plus diesel PM (noncancer results only).



## http://www.epa.gov/ttn/atw/nata2005/ 4/25/2011