<th>ef</th>
      <td><p>emission factors from EmissionRates_running exported from MOVES</p></td>
    </tr>
    <tr>
      <th>source_type_id</th>
      <td><p>Number to identify type of vehicle as defined by MOVES.</p></td>
    </tr>
    <tr>
      <th>fuel_type_id</th>
      <td><p>Number to identify type of fuel as defined by MOVES.</p></td>
    </tr>
    <tr>
      <th>pollutant_id</th>
      <td><p>Number to identify type of pollutant as defined by MOVES.</p></td>
    </tr>
    <tr>
      <th>road_type