CMAQ Emissions Calculator Toolkit: On-Road Diesel Repower or Replacement

The purpose of the Congestion Mitigation and Air Quality Improvement Program Emissions Calculator Toolkit (CMAQ Toolkit) is to help a user with limited modeling experience estimate emission reductions associated with implementation of a CMAQ-funded project. The CMAQ Toolkit uses emission rates and activity data based on national-scale runs of the U.S. Environmental Protection Agency’s (EPA) Motor Vehicle Emission Simulator (MOVES). The diesel repower/replacement project emission reductions calculator estimates emission reductions for repowering/replacing heavy-duty diesel vehicles (excluding transit vehicles) of a given model year with a newer diesel vehicle of a more recent model year. Emission reductions are estimated by calculating the reduction in both running and starts emissions, as well as, if applicable, extended idling emissions (referred hereafter as hotelling hours) and comparing it to the emissions from the replacement engines or vehicles. This document is organized into three sections – User Guide, Tool Methodology, and Examples – to aid the user in understanding and interpreting results from the calculator.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Tables;
  • Pagination: 14p

Subject/Index Terms

Filing Info

  • Accession Number: 01760443
  • Record Type: Publication
  • Created Date: Dec 1 2020 4:55PM