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NARSTO Workshop on Innovative Methods for Emission Inventory Development and Evaluation University of Texas, Austin October 14-17, 2003 |
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EPA's Plans to Estimate the Criteria Air Pollutant Emissions of Highway Vehicles and Off-Highway Equipment with MOVES
Gene Tierney
EPA Office of Transportation and Air Quality
MOVES is EPA´s new mobile source air pollutant emissions model. It will replace the current MOBILE6 and NONROAD models with one completely redesigned to offer consistent emission rate estimation across multiple scales.
This presentation briefly reviews the scope of MOVES_GHG, the first version of MOVES , and the methodology EPA is using to estimate the greenhouse gas emissions of highway sources. Where data is available MOVES_GHG uses second-by-second measurements to calculate and bin vehicle specific power and associates this with emission rates. Ongoing work with the engine friction component of this power calculation promises to eliminate most dependence on driving patterns or average speed. Where such data is not available MOVES_GHG uses a Physical Emission Rate Estimator (PERE), which is calibrated to known data.
MOVES_GHG will also include life cycle analysis, i.e. upstream emissions estimates (well to pump analysis) for advanced technology vehicles through the use of GREET.
The presentation elaborates EPA´s plans for expanding MOVES to include criteria air pollutants and non-highway mobile sources, including:
- modeling cold start and running emissions using VSP
- elaboration of PERE to model engine and tailpipe emissions
- accounting for high-emitting vehicles
- including the effect of odometer reading and/or vehicle age
- more elaborate consideration of the effects of local emission control programs
- emission rate adjustments for temperature, humidity, altitude and fuel
- inclusion of evaporative emissions
Finally the presentation touches on how the uncertainty estimates of MOVES_GHG may be adapted for these more elaborate emission rate calculation methods.