Applicability Determination Index

The Applicability Determination Index (ADI) is a web-based database that contains memoranda issued by EPA on applicability and compliance issues associated with air pollution regulations (e.g., National Emissions Standards for Hazardous Air Pollutants, New Source Performance Standards). Use the links below to access the ADI for specific surface coating topics. Alternatively, you can create your own customized search on the ADI Search page.

EPA 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. See partial list of determinations relevant to painting and solvent cleaning.