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41 California Air Resources Board (CARB)âA clean air agency established by the government of California in 1967. One of CARBâs responsibilities is the setting/refinement of emissions stan- dards for the motor vehicles sold/registered to operate within the state. Clean Air Act (CAA)âA federal law established in 1970 to regulate air emissions from station- ary and mobile sources. The CAA was amended in 1977 and 1990, at which time new timelines were established for areas of the United States to achieve attainment of the NAAQS. Dispersion modelingâThe mathematical simulation of the dispersement of air pollutants in the ambient (i.e., outdoor) air. Emissions modelingâPreparation of data for input to a computer model that provides esti- mates of air pollutants, pollutant precursors, hazardous air pollutants (HAPs), and/or greenhouse gases (GHG). Estimates of the individual pollutant, precursor, or gas typically are expressed in tons per year. General Conformity RuleâUnder the CAAâs General Conformity Rule, federal non-highway and transit agencies must work with state, tribal, and local governments in an air quality non- attainment or maintenance area to ensure that actions by the agencies conform to plans to reduce or maintain levels of air pollutants to comply with the NAAQS. Ground access vehicles (GAV)âMotor vehicles that travel to, from, and on the airportâs access/ egress roadways and other landside facilities (e.g., parking areas). Hot-spot analysisâAn air quality assessment for a location where emissions from one or more specific sources may expose the public to elevated pollutant concentrations. Hub airportâAn airport at which passengers arrive from multiple cities and countries and shortly thereafter depart to a different airport. FAA categorizes hub airports as being small (processing from 0.05% to 0.25% of all passenger boardings/enplanements within the United States), medium (processing 0.25% to 1% of the boardings), and large (processing more than 1% of the boardings). Originating and destination (O-D) passengersâPassengers whose flight itinerary begins or ends at an airport (as opposed to those whose flights connect within the airport). Transportation Conformity RuleâA requirement of the CAA, this rule ensures that federal funding and approval are given to highway and transit projects that are consistent with the air quality goals established by individual states to reduce and/or maintain levels of air pollutants to comply with the NAAQS. Trip generation modelsâComputer models that estimate the number of home-based motor vehicle trips to and from zones where âtrip makersâ (i.e., destinations) are located. Vehicle-miles traveled (VMT)âA measurement of the total number of miles traveled by all vehicles within a specified region, area, or roadway over a specified period of time. Glossary