Jump to main content or area navigation.

Contact Us

EPA's Region 6 Office

Serving: Arkansas, Louisiana, New Mexico, Oklahoma, Texas, and 66 Tribal Nations

Region 6 - Clean Air Act (CAA) Resources


Applicability Determinations, Alternative Monitoring, and Compliance Assistance Projects (ADAM-CAP)

On a national level, EPA issues hundreds of letters or memoranda per year on CAA applicability or monitoring issues under the New Source Performance Standards (NSPS) and the National Emission Standards for Hazardous Air Pollutants (NESHAP) programs. These written responses are broadly termed “applicability determinations” and are maintained in a national database referred to as the “ADI”. The national database is searchable and accessible via EPA's National ADI Webpage, where general direction and the National Guidance (PDF) (107 pp, 1.51 MB, About PDF ) (dated February 1999) on how to review and issue CAA applicability determinations is provided.

On a regional level, authorities for responding to specific ADAM-CAP requests vary based upon the type of Region 6 delegation agreement, and depend upon delegable authorities established by statute, part, and subpart.  In cases involving national consistency, we coordinate closely with EPA’s Office of Air Quality Planning and Standards (OAQPS) , EPA’s Office of Enforcement and Compliance Assistance (OECA) and Region 6 State/Local/Tribal Partners who may or may not have delegated authority for a particular CAA program, but are the permitting authority under the CAA.

In our effort to streamline handling of all ADAM-CAP requests received in our office, we have transitioned to electronic tracking of all requests and have assigned staff responsible for answering questions dealing with individual subparts of the rules. The following web based resources are intended to help companies formulate a complete ADAM-CAP request and get the request to the right agency.

1. Region 6 Specifics for ADAM-CAP
a. The Basics
b. Delegations Unraveled (includes summary tables)
c. Information by Region 6 State/Local/Tribal Partners
d. Who's Who in Air Enforcement
e. Guidelines for Particular Projects [Under Development]

2. National Websites by Interest
a. Technology Transfer Network (TTN)
  i. Rules & Implementation
 ii. Emissions Measurement Center
iii. Source Category Approved Alternative Methods
iv. OAR Monitoring Knowledge Base
b. State, Local, Tribal, and Federal Partnerships Air Toxics Webpage
c. TribalAIR Website
d. Tribal Air Program Resources Webpage


3. Code of Federal Regulations (CFRs)
a. e-CFR (electronic CFRs by Part and Subpart)
b. GPO Access (CFR by Date)
c. HEIN Online
  i. EPA Agency Access (Direct Link for Office Employees)
 ii. Public Access (Subscription Required)
iii. Students (Check Subscription via University Librarian)

If uncertainty exists about who should handle your particular project, please feel free to call or submit your ADAM-CAP request to our office as well as your State/Local/Tribal CAA office.  We will coordinate all efforts to ensure appropriate handling of your request. On a final note, EPA’s CAA Compliance Assistance Program provides additional tools and resources for those needing assistance in areas unrelated to applicability or alternative monitoring under the NSPS/NESHAP programs (e.g., notification questions, newly issued rule resources, etc).

Jump to main content.