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55 APEX Aircraft Particle Emissions eXperiment APU auxiliary power unit ATSDR Agency for Toxic Substances and Disease Registry BMC benchmark concentration BMCL lower 95% confidence limit on the benchmark concentration BOS Boston Logan International Airport CARB California Air Research Board CIIT Chemical Industry Institute of Toxicology CO carbon monoxide CO2 carbon dioxide EDMS Emissions and Dispersion Modeling System EI emissions index EPA U.S. Environmental Protection Agency EtO ethylene oxide FAA Federal Aviation Administration FLL Fort Lauderdale Hollywood International Airport GAV ground access vehicles GSE ground support equipment HAP hazardous air pollutant, also known as âair toxics.â In the context of this report, particulate matter is excluded HBEL health based exposure level HC hydrocarbon HCHO formaldehyde HEC human equivalent concentration HVAC heating, ventilating, and air-conditioning ICAO International Civil Aviation Organization ILEAV Inherently Low Emission Airport Vehicle Pilot Program IRIS Integrated Risk Information System ISCST3 Industrial Source Complex Short Term Model IUR inhalation unit risk LOAEL lowest observed adverse effect level LTO landing take-off MDW Chicago Midway Airport mg/m3 milligrams per cubic meter MRL minimum risk levels NAAQS National Ambient Air Quality Standards NEPA National Environmental Protection Act NMHC nonmethane hydrocarbons NO2 nitrogen dioxide NOAEL no observed adverse effect level O3 ozone OAK Oakland International Airport OEHHAT Office of Environmental Human Health Assessment Toxicity ORD Chicago OâHare International Airport PAH polycyclic aromatic hydrocarbon PARTNER Partnership for AiR Transportation Noise & Emissions Reduction Pb lead PDX Portland International Airport PHL Philadelphia International Airport pptv parts per trillion by volume ppbv parts per billion by volume ppmv parts per million by volume ppmw parts per million by weight RBC risk-based concentration REL recommended exposure limit RfC reference concentration RIVM National Institute for Public Health and the Environment of the Netherlands SIP State Implementation Plan SO2 sulfur dioxide TC tolerable concentration TERA Toxicology Excellence in Risk Assessment THC total hydrocarbon tons Emission inventories in the U.S. traditionally express mass in tons, which is an ambiguous term since there are three types of tons: metric tons (2,200 lbs), imperial tons (2,240 lbs), and short tons (2,000 lbs). In this document the term âtonâ refers to short tons. TPHCWG Total Petroleum Hydrocarbon Criteria Working Group TSP total suspended particulate UHC unburned hydrocarbon. This term is slightly misleading since some HC emissions from aircraft are better de- scribed as âpartiallyâ burned (e.g., aldehydes) VALE Voluntary Airport Low Emission program VOC volatile organic compound. According to the EPA, (s) âVolatile organic compounds (VOC) means any com- pound of carbon, excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate, which participates in atmospheric photochemical reactions. This includes any such organic compound other than the following, which have been determined to have negligible photochemical reactivity: Methane, ethane, methylene chloride, CFCs, HFCs, HCFCsâ. From www.epa.gov/ttn/naaqs/ozone/ozonetech/ def_voc.htm. A B B R E V I A T I O N S A N D A C R O N Y M S
