July 22, 2016

MEMORANDUM

SUBJECT:	Greenhouse gas Emission Model" (GEM) simulation tool, Version 3.0
FROM:	Houshun Zhang, OTAQ/ASD

TO:	Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles - Phase 2 - EPA-HQ-OAR-2014-0827


The attached document includes the source code for Version 3.0 of the Greenhouse gas
Emission Model" (GEM) simulation tool. This model was developed to support the greenhouse gas emission standards for heavy-duty highway engines in 40 CFR part 1037. The model was finalized in July 22, 2016.

A compact disk with the executable files for GEM is also included.

Attachments
