Aircraft and Airport-Related Hazardous Air Pollutants: Research Needs and Analysis (2008) / Chapter Skim
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Pages 3-8
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From page 3... ...
In addition to the criteria pollutants, there are more than one hundred other air pollutants that are either known or suspected to be hazardous. These are known as "hazardous air pollutants" or HAPs, or alternately "air toxics." Two commonly known examples are benzene and formaldehyde.
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This report provides a preliminary assessment of which airport sources and which individual hazardous air pollutants should be closely considered in future research. This assessment is based on both the toxicity of the individual pollutants and the amount emitted.
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. It is likely that many current airport emission inventories underestimate aircraft HAP emissions as the 5 Figure 1.
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Acrolein 1,3-Butadiene Formaldehyde Benzene Acetaldehyde Naphthalene Toluene Notes: HAP hazardous air pollutant FAA Select Resource Materials and Annotated Bibliography on the Topic of Hazardous Air Pollutants (URS 2003) ORD O'Hare Modernization Environmental Impact Statement (FAA 2005)
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From page 7... ...
This introduces large uncertainties in emission inventories and risk assessment, since HAP emissions are very sensitive to small changes in engine power. 7 HAP Basis for Concern Crotonaldehyde Crotonaldehyde is structurally similar to the highly reactive compound acrolein, and its airport emissions may be comparable to those of benzene and 1,3-butadiene.
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From page 8... ...
HAP emissions (with the exception of lead) from piston engine aircraft, turbojet engines, and low-bypass turbofan engines (such as business jets)
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