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Glossary
Pages 33-34

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From page 33... ... downstream from the outer edge of the nozzle Fine particle2 -- particle with a classical aerodynamic diameter less than 2.5 μm Geometric mean2 -- the nth root of the product of n numbers HAPs -- hazardous air pollutants, 188 pollutants that the Clean Air Act Amendments of 1990 required EPA to regulate; also referred to as "air toxics"; the complete list of pollutants can be found in Appendix C: The Clean Air Act Amendments of 1990 List of Hazardous Air Pollutants and on the EPA website: http://www.epa.gov/ttn/atw/ orig189.html; for the purpose of this report, particulate matter, while hazardous and potentially toxic, are not included in the definition of HAPs (See also related report ACRP 02-03, Aircraft and Airport-Related Hazardous Air Pollutants: Research Needs and Analysis) Line loss -- percent of particles lost during transit through a given sample line; particle loss mechanisms include impaction, diffusion, settling (gravitational) Read the entire page →
From page 34... ... of filter area Soot -- nonvolatile diesel particulate matter, also referred to as black carbon or elemental carbon (see above) Total carbon1 -- the sum of elemental carbon and organic carbon Transients -- a momentary or temporary variation in a variable of interest, e.g., engine power, ambient pressure, temperature Ultrafine particles -- particles with a classical aerodynamic diameter of less than 0.1 μm Volatile particles1 -- particles formed from condensable gases after the exhaust has been cooled to below engine exit conditions 34 Read the entire page →

From page 33...

... downstream from the outer edge of the nozzle Fine particle2 -- particle with a classical aerodynamic diameter less than 2.5 μm Geometric mean2 -- the nth root of the product of n numbers HAPs -- hazardous air pollutants, 188 pollutants that the Clean Air Act Amendments of 1990 required EPA to regulate; also referred to as "air toxics"; the complete list of pollutants can be found in Appendix C: The Clean Air Act Amendments of 1990 List of Hazardous Air Pollutants and on the EPA website: http://www.epa.gov/ttn/atw/ orig189.html; for the purpose of this report, particulate matter, while hazardous and potentially toxic, are not included in the definition of HAPs (See also related report ACRP 02-03, Aircraft and Airport-Related Hazardous Air Pollutants: Research Needs and Analysis) Line loss -- percent of particles lost during transit through a given sample line; particle loss mechanisms include impaction, diffusion, settling (gravitational)

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From page 34...

... of filter area Soot -- nonvolatile diesel particulate matter, also referred to as black carbon or elemental carbon (see above) Total carbon1 -- the sum of elemental carbon and organic carbon Transients -- a momentary or temporary variation in a variable of interest, e.g., engine power, ambient pressure, temperature Ultrafine particles -- particles with a classical aerodynamic diameter of less than 0.1 μm Volatile particles1 -- particles formed from condensable gases after the exhaust has been cooled to below engine exit conditions 34

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Glossary Pages 33-34

Glossary
Pages 33-34