Glossary of Terms


RICE NESHAP Acronym for National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines.
HAP Hazardous Air Pollutant. HAPs of concern for diesel RICE are 1,3-butadiene, acetaldehyde, acrolein, benzene, ethylbenzene, formaldehyde, n-hexane, naphthalene, PAH, polycyclic organic matter, styrene, toluene, and xylene. HAPs of concern for SI RICE include 1,3-butadiene, 2,2,4-trimethylpentane, acetaldehyde, acrolein, benzene, ethylbenzene, formaldehyde, hexane, methanol, methyl chloride, naphthalene, PAH, toluene, and xylene.
MAJOR Source Has the potential to emit >10 tons of any one HAP or >25 tons of all HAPs per year.
AREA Source Anything not a MAJOR source.
Stationary Not used in a motor vehicle and not a nonroad engine. Nonroad engines are self-propelled (tractors, bulldozers, etc.), propelled while performing their function (lawnmowers), or portable or transportable (has wheels, skids, carrying handle, dolly, trailer, or platform). A portable nonroad engine becomes stationary if it resides at a location more than 12 months.
Reconstructed Engine An engine where components are replaced or refurbished to such an extent that the fixed capital cost of the new and refurbished components exceeds 50 percent of the fixed capital cost of a comparable new engine.