Tions of vehicle age/mileage (zero-mile levels and deteriora. MOBILE 1đ978 Included modeling of exhaust emissions rates as func. TECHNICAL ISSUES ASSOCIATED WITH THE M OBILE MODELĖ3 Provided by local or regional transportation-planning agencies. Summed, or the fleet average emissions factor is multiplied by total VMT Mates of vehicle miles traveled (VMT) by vehicle class for the area and Given area, either the vehicle class emissions factor is multiplied by esti. To estimate total on-road mobile emissions in a Sions differences between, for example, vehicles with carburetors and Ther subdivided into technology classes in MOBILE, to account for emis. National mix of vehicles the user can optionally input a different fleet mixįor the calculation of fleet average emissions. Listed in Table 3-2, and also for the average on-road fleet using a default The model provides emission factors separately for the classes of vehicles On-road vehicles for the three regulated pollutants: VOCs, CO, and NOX. The MOBILES model, released in 1993, provides emission factors for 1 to MOBILE5a, while still remaining lower than Volatile organic compound (VOC) emissions, though, de-Ĭreased from MOBILE4 to MOBILE4.1, and then increased significantlyįrom MOBILE4. Nitrogen oxides (NOx) increase from one model to the next, albeit in differ-Įnt proportions. Carbon monoxide (CO) emissions and emissions of These comparisons are unaffected by the inclusion of new emissions stan-ĭards and regulations. Lease versions of the model (MOBILE5a, MOBILE4.1, and MOBILES Models should provide more accurate analyses of mobile source emissionsĪnd of the effects of mobile source control programs.Īs an example, Figure 3-1 shows emissions for the Baltimore area forĬalendar years 19 as predicted using three recent official re. Target for air-quality planners and the regulated industries, the revised Although these changes created somewhat of a moving From one model version to the next, theseĬhanges can be either increases or decreases in emissions factors, and theĬhanges are not always in the same direction for all three pollutants (NOX,ĬO, and VOCs). Ing methodology in each successive version result in changes to predicted Release dates, and changes in each model update are summarized in TableĬhanges in the databases underlying the models and changes in model. Toring emissions-factor estimates to local conditions. Hicle emissions, and has provided the user with additional options for tai. Has become more complex in the approach to modeling average in-use ve. Vehicle emissions were better understood. Gated, emissions standards were established, and sources and processes of Gramming language, has had significant updates and new releases everyįew years as new data became available, new regulations were promul. The model, originally and still written using the Fortran scientific pro. Lished simple look-up tables for estimation of mobile-source emissions. Grams per mile ) was first developed by the U.S. The MOBILE model for estimating on-road vehicle emissions factors (in The chapter concludes with a summaryĪnd recommendations related to technical aspects of the model. This chapter then focuses on the technical issues associated with the mod-Įl, such as how the model handles high emitters, driving cycle, start emis. ROAD, and others) and previous reviews of the model. Related models for estimating mobile-source emissions (PARTS, NON. The introductory portion of this chapter discusses the development of Rent (MOBILES) and upcoming (MOBILE6) versions of the MOBILE mod-Įl. THE FOCUS OF CHAPTER 3 is the technical issues associated with the cur. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.
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