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

,,\t~, 

s

,~ r~s http://ww~ro.epa.qov/ttn/atw/nata2005/ 

u

last u dated on Friday, March 11, 2011 

Technology Transfer Rle twork Air ~oxics 

2005 Na ~ tionaR-Scaie Air Toxics Assessment 

You are here: EPA_ Home Air & Radiation TTN Web - Technology 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 toxicemissions. 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) plusdiesel 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 SheetandSumma 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 assessment ( 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 itsNATA 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