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MOBILE4 SENSITIVITY ANALYSIS
Citation:
Smith, M. G. AND T. T. Wilson. MOBILE4 SENSITIVITY ANALYSIS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/8-91/032 (NTIS PB91-191312), 1991.
Impact/Purpose:
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Description:
The report identifies the MOB1LE4 input variables that can have significant impacts on highway vehicle emissions inventories and gives priorities for the development of improved guidance for specifying MOB1LE4 inputs. wo major factors are considered: (1) the likelihood and potential range of variability in values for each MOB1LE4 input; and (2) the potential magnitude of the effect of these variations, in terms of impact on typical mobile source inventories. The analysis updates previous work based on MOB1LE3 by using MOB1LE4 for the sensitivity analysis and by adding new MOB1LE4 variables. The approach used in previous work is modified to address the specific concerns of this project-- the State Implementation Plan (SIP) and National Emissions Data System (NEDS) inventory/guidance context. n additional level of detail is included for two critical variables (speed and temperature). ensitivity to basic vehicle inspection/maintenance program specifications (waiver and compliance rate) is also considered. The primary sensitivity analysis is structured around two base cases representing ozone and carbon monoxide (C) season conditions. The report describes: (1) MOB1LE4 input variable values for the ozone and CO base cases, (2) the variables and ranges or alternate values applied in the sensitivity analysis, (3) sensitivity analysis results, and (4) conclusions.