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Data Profile: National Toxics Inventory (NTI)
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National Toxics Inventory (NTI)
The U.S. Environmental Protection Agency's National Toxics Inventory (NTI) is a complete national inventory of stationary and mobile sources of hazardous air pollutants (HAPs). HAPs are defined as pollutants that are known or suspected to cause serious health problems.

Section 102 of the Clean Air Act (CAA) currently identifies a list of 188 pollutants as HAPs. The list of HAPs includes relatively common pollutants such as formaldehyde, chlorine, methanol, and asbestos, as well as numerous less common substances. Individual emission estimates are available for large stationary sources, while aggregate emission estimates at the county level are available for small stationary and mobile sources.

Available data series include pollutants emitted per state, county, or source.

Visit the National Toxics Inventory.
NTI covers all 50 States, the District of Columbia, Puerto Rico, and the Virgin Islands.
First Year1993
Last Year1999
FrequencyEvery three years
   Summary Tables
   National Transportation Statistics
U.S. Carbon Dioxide Emissions from Energy Use by Sector, 1990-1998
Air Pollution Trends in Selected Metropolitan Statistical Areas
Areas in Nonattainment of National Ambient Air Quality Standards for Criteria Pollutants
Estimated National Emissions of Carbon Monoxide
Estimated National Emissions of Lead
Estimated National Emissions of Nitrogen Oxides
Estimated National Emissions of Particulate Matter (PM-10)
Estimated National Emissions of Particulate Matter (PM-2.5)
Estimated National Emissions of Sulfur Dioxide
Estimated National Emissions of Volatile Organic Compounds
   Related Links
Aerometric Information Retrieval System Database
Emissions by Economic Sector, Excerpt from the Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2000
Key Source Category Analysis for the Inventory of U.S. Greenhouse Emissions and Sinks: 1990-1999 Final Draft
National Emission Trends database
   Data Source and Contacts
Data Provider AgencyU.S. Environmental Protection Agency
Data Provider OfficeAir and Radiation Office
BTS ContactTranStats Customer Support
Phone:(800) 853-1351
Email: ritainfo@dot.gov