1999 National-Scale Air Toxics Assessment: 1999 Data Tables

Note: EPA no longer updates this information, but it may be useful as a reference or resource.

The following may be useful in analyzing the results in the tables:

Document detailing units (PDF 3 pp.,31 KB) for the tables provided on this webpage.
Download table of information (Size: 156 KB; Format: Microsoft Access 2000) which lists each pollutant in the assessment along with the following: any variations in pollutant name format used in the State summary and pollutant-specific Microsoft Access files; Chemical Abstracts Service (CAS) registry number; and indication of whether the pollutant has cancer and noncancer health effects.
Health Effects Information Used in Cancer and Noncancer Risk Characterization (PDF 12 pp., 182 KB)
Information about the unit risk estimate (URE) for formaldehyde EPA selected for this assessment
1999 National Emissions Inventory data page is a resource for source-specific hazardous air pollutant emissions.
Issues with the National Emissions Inventory
Information about the background concentrations EPA assigned to 28 of the air toxics and diesel PM. This is the component of the outdoor concentrations of the pollutant estimated to be attributable to long-range transport, unidentified emission sources, and natural emission sources.
Approach for modeling Polcyclic Organic Matter (POM) (PDF 6 pp., 541 KB)

County-Level Risk Summaries (Microsoft Excel 2000)

The first three Microsoft Excel 2000 spreadsheets provide percentile distribution of risk across census tracts, and contribution by source sector to the average risk for each county in the U.S. plus Puerto Rico and the Virgin Islands. The fourth Microsoft Excel 2000 spreadsheet contains the pollutant-specific contribution to the total risk.

County-Level Emission Summaries (Microsoft Access 2000)

Provides pollutant-specific tons/year emissions, including breakdown by source sector, for each county in the U.S. plus Puerto Rico and the Virgin Islands. These data are presented for 85 pollutants (plus 2 extra subgroupings for arsenic and 8 additional subgroupings of POM) out of the 177 pollutants modeled, and were selected based on the following: pollutant is estimated to present either a cancer risk greater than 1 in a million or a hazard quotient greater than 0.1 in at least one census tract.

Note: You must save file before opening.

County-Level Ambient Concentration Summaries (Microsoft Access 2000)

Provides pollutant-specific ambient concentration statistics (in micrograms per cubic meter)at the country-level, including breakdown of the average (mean) country-level concentration by source sector, for each county in the U.S. plus Puerto Rico and the Virgin Islands. These data are presented for 85 pollutants (plus 2 extra subgroupings for arsenic and 8 additional subgroupings of POM) out of the 178 pollutants modeled, and were selected based on the following: pollutant is estimated to present either a cancer risk greater than 1 in a million or a hazard quotient greater than 0.1 in at least one census tract. To better understand the measurement units presented in these files please access this detailed explanation.(PDF 3 pp., 31KB)

Note: You must save file before opening.

Pollutant-Specific Database (Microsoft Access 2000)

Pollutant-specific, census tract-level estimates for the whole U.S. plus Puerto Rico and the Virgin Islands including risk, modeled ambient concentration, and exposure estimates (if modeled). Due to the size of the pollutant list, the hazardous air pollutants are divided alphabetically into two groups below. To better understand the measurement units presented in these files please access this detailed explanation.(PDF 3 pp., 31KB)

Note: You must save file before opening.

Group 1 (A-G)

Group 2 (H-X)

Census Tract-Level State Summary Database of Risk Results (Microsoft Access 2000)

State-specific census tract-level risk files including the contribution of each pollutant to overall risk (cancer, noncancer-respiratory and noncancer-neurological) and the source sector contribution to risk. To better understand the measurement units presented in these files please access this detailed explanation.(PDF 3 pp., 31KB)

Note: You must save file before opening.

State Summary Databases (Microsoft Access 2000)

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