Science & Technology

This page shows all of the pages at www.epa.gov that are tagged with Science & Technology.

  • How are the Number of Weekdays and Weekend Days in each Month Determined in MOVES?

    See More Frequent Questions about MOVES and Related Models. For any given month, MOVES assumes that 5 out of every 7 days in the month are ‘weekdays’ and 2 out of every 7 of days in the month are ‘weekend days.’ For example, MOVES assumes that January has (5/7)*31 weekdays…

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  • What are Possible Causes of MySQL Query Errors?

    See More Frequent Questions about MOVES and Related Models. You need to make sure the character set in the MySQL my.ini file is set to UTF-8. MOVES does not recognize other character sets and this will result in incorrect or incomplete output.

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  • What Drives Seasonal CO Emission Trends?

    See More Frequent Questions about MOVES and Related Models. Once a vehicle’s engine/catalyst reaches operating temperature, the ambient temperature has little effect on the emissions performance of the vehicle. These “running” emission rates in MOVES have no temperature adjustment. However, during summer months at warm temperatures, MOVES assumes extensive use…

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  • How does MOVES Define Light Duty Trucks?

    See More Frequent Questions about MOVES and Related Models. There are two definitions used in MOVES for light duty trucks. The source use type light duty trucks (sourceTypeID values of 31 or 32) use the Federal Highway Administration (FHWA) VM-1 definition of light duty vehicles used to report vehicle activity…

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  • What is the Relationship Between Calendar Year, Model Year, and Age?

    See More Frequent Questions about MOVES and Related Models. Model year (modelYearID) corresponds to the year that a group of vehicles in the fleet was produced. Calendar year (yearID) is the analysis year as selected in the ‘Time Spans/Year’ panel of the MOVES GUI. For a given calendar year, the…

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  • What are the Units of Road Grade in the Links Table?

    See More Frequent Questions about MOVES and Related Models. The field road grade in the Links table should be entered as a percentage rather than a decimal fraction. In other words, a road grade of 4% should be entered in MOVES as 4, rather than 0.04.

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  • Why Are There No Emissions for the Early and Late Hours of the Day for Certain Source Types?

    See More Frequent Questions about MOVES and Related Models. MOVES has no start emissions for the certain source types in certain hours of the day. While we know that a non-zero number of these source types do start late at night, our activity data on these trucks and buses did…

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  • Background Information on the South Platte Urban Waters Federal Partnership

    Fact Sheet providing background information on the South Platte Urban Waters Location.

  • What Should I Do About this Warning: "Warning: A Work File Failed. Calculations will be Retried. No data has been lost."?

    See More Frequent Questions about MOVES and Related Models. This is just a warning message not an error message so there is nothing to fix. This is a internal timing issue when the MOVES worker tries to access a file and there is a lock on it. This lock could…

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  • What is Vehicle Specific Power (VSP)?

    See More Frequent Questions about MOVES and Related Models. It is an estimate of the power demand on the engine during driving. It is calculated using the second-by-second speed values in a driving schedule, along with information about the type of vehicle being operated. The VSP is used by MOVES…

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  • What is the Meaning of the MOVESScenarioID Field? What Conditions Must User-Defined MOVESScenarioIDs Meet?

    See More Frequent Questions about MOVES and Related Models. The MOVESScenarioID is merely text that is used to label the output rows resulting from a MOVES rates run and is defined in the Scale Panel of the MOVES GUI. You can enter any text you like, as long as you…

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  • Where Can I Find Default HPMSBaseYearVMT Values for a Specific County?

    See More Frequent Questions about MOVES and Related Models. MOVES does calculate default values for VMT for each calendar year for each county. Since these values are calculated, they are not found in any table in the default database. If you wish to obtain the default estimates, you will need…

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  • Why Doesn't my Output Vehicle Miles Traveled (VMT) Match my Input VMT?

    See More Frequent Questions about MOVES and Related Models. This problem usually occurs when the run specification does not include all possible vehicle and fuel types. MOVES internally allocates the input VMT to each of the source types and fuel types and only reports the VMT for the fuel types…

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  • How Can I Reduce the Time Needed to Run the Nonroad Emission Factor Post-Processing Scripts?

    See More Frequent Questions about MOVES and Related Models. Very long run times are not unusual for Nonroad emission factor post-processing scripts, particularly with a large output database. To reduce script run time, we recommend doing the following: Reduce the size of your output database by choosing just the amount…

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  • Can MOVES Report Output in Terms of Fuel Consumption?

    See More Frequent Questions about MOVES and Related Models. Although gallons of fuel consumed are not reported by MOVES, the factors used to convert total energy consumption (a MOVES reporting option) to gallons of fuel are contained in the FuelSubtype table (energy content, reported in kilojoules per gram of fuel)…

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  • Does MOVES Incorporate Anticipated Improvements in VOC Emission Factors Resulting from Improved Fuel Economy?

    See More Frequent Questions about MOVES and Related Models. Changes in fuel consumption affect VOC emissions by reducing refueling vapor losses and spillage. Other emissions (such as sulfates) are also affected by fuel consumption. MOVES incorporates changes due to fuel economy requirements that were finalized as of the date of…

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  • Why in my Nonroad Results do I Have a fuelTypeID not Listed in the FuelType Table?

    See More Frequent Questions about MOVES and Related Models. The fuel types used by the nonroad part of MOVES is not located in the FuelType table. If you look in the NRFuelType table you will see that 23 is for nonroad diesel fuel and 24 is for marine diesel fuel.

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  • What Pollutants are Included in “oxides of nitrogen” in MOVES?

    See More Frequent Questions about MOVES and Related Models. The definition of NOx in MOVES (NO + NO2 + HONO) is different than the standard NOx definition of NOx (NO + NO2). This change has been made to correct the exhaust NOx emission in MOVES for potential interference with HONO…

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  • Konecranes PLC —Tier 4F EcoLifting Hybrid System

    EPA confirms verification request from Konecranes PLC regarding the EcoLifting Hybrid System (EcoLifting) replacing generators (Tier 0, 1, 2, 3) for non-road diesel engines on rubber tired gantry cranes (RTG), reducing emissions of criteria pollutants.

  • Is There a Way to Model Emissions of a Single Vehicle on a Given Route in MOVES?

    See More Frequent Questions about MOVES and Related Models. MOVES is designed to model fleet emissions, but the project scale in MOVES allows you to model a single average vehicle on a link (road segment). The project scale requires the user to import detailed data, including vehicle population. By importing…

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