1996 National Air Toxics Screening Assessment

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

The EPA's 1996 National Air Toxics Screening Assessment, targeted for completion by December 2000, will help to characterize the potential health risks associated with inhalation exposures to 33 priority toxic air pollutants plus diesel particulate matter (diesel PM). The 1996 assessment includes the following four major steps:

Compiling a 1996 national emissions inventory of air toxics emissions from outdoor sources.
Estimating 1996 ambient concentrations of air toxics across the contiguous United States.
Estimating 1996 population exposures across the contiguous United States.
Characterizing potential public health risks due to inhalation of air toxics, including both cancer and noncancer effects.

You can see the results of the first two steps on this website now.

• Scope of Assessment & Background
• Use of Results
• Limitations & Uncertainties
• 1996 Assessment Results
• Glossary of Terms
• Frequently Asked Questions

1996 National Air Toxics Screening Assessment

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