Clean Diesel

Diesel Emissions Quantifer (DEQ)

Logging in to the DEQ allows you to save and retrieve information for review and/or revision.

Important Notice

Emission results may have changed for certain onroad vehicles or upgrades saved in the DEQ between July 27, 2016 and February 10, 2018.

Due to a recent update in the DEQ, your emission results may change when you re-quantify a project with any of the following vehicles:
  • Short Haul - Single Unit (Classes 3, 4-5, 6-7, 8)
  • Short Haul - Combination (Class 8)
  • Long Haul - Single Unit (Classes 6-7, 8)
If the vehicle types above had any of the following upgrade(s) added, please delete and re-enter the upgrade to ensure that your emission results are correct.
  • Idling Control Strategies (All except "Other")
  • Fuel Options (All except "Other")
  • Vehicle/Engine Replacements (Diesel, CNG, LNG, LPG/Propane)

Use the DEQ without logging in