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Air Data Systems

Data Systems

The following data systems support the enforcement and compliance assurance program for air.

Air Facility System (AFS) contains compliance and permit data for stationary sources regulated by EPA, state and local air pollution agencies.

The National Asbestos Registry System (NARS) Web page is no longer available. State and local agencies are no longer required to submit data uploads for inclusion in NARS. If you have questions concerning NARS data or asbestos contractors, please visit EPA's Asbestos Web Site.

Applicability Determination Index (ADI) currently issues over 100 EPA written responses (i.e., letters or memoranda) per year on Clean Air Act (CAA) applicability ("applicability determinations") or monitoring issues ("alternative monitoring decisions") pursuant to the New Source Performance Standards (NSPS, 40 CFR Part 60) and the National Emission Standards for Hazardous Air Pollutants (NESHAP, 40 CFR Parts 61 and 63) programs. Also, EPA issues applicability determinations pursuant to the chlorofluorocarbons (CFC) regulations (40 CFR Part 82). In addition, EPA issues "regulatory interpretations" which are written responses that apply to the broad range of NSPS and NESHAP regulatory requirements as they pertain to a whole source category.

The air data systems support the Agency's air compliance assistance, air compliance monitoring, and air civil enforcement.


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