NESHAP

National Emission Standards for Hazardous Air Pollutants (CAA: 40 CFR, PART
60); a set of national emission standards for a list of hazardous pollutants
emitted from specific classes or categories of new and existing sources. 
These include and were introduced in the Clean Air Act Amendments of
1997.  Under Title III of the 1990 CAAA, hazardous air pollutants are by
definition included in the NESHAP’s program.