EPA currently issues over 100 letters or memoranda per year on Clean Air Act (CAA) applicability or monitoring issues under the New Source Performance Standards (NSPS, 40 CFR 60) and the National Emission Standards for Hazardous Air Pollutants (NESHAP, 40 CFR 61 and 63) programs. These written responses are broadly termed "applicability determinations". The ADI also contains "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; and applicability determinations issued pursuant to the chlorofluorocarbons (CFC) regulations, cited in 40 CFR 82. The ADI, a computerized database of such letters and memoranda, allows users to search by date, office of issuance, subpart, citation, control number, or string word searches.
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Executive Order 14057
