CA Phase 2 GHG

This page last reviewed August 16, 2016

Background

Phase 2 Truck imageCalifornia Air Resources Board (ARB) staff worked jointly with the U.S. Environmental Protection Agency (U.S. EPA) and the National Highway Traffic Safety Administration (NHTSA) on the next phase of federal greenhouse gas (GHG) emission standards for medium- and heavy-duty vehicles, called federal Phase 2. The federal Phase 2 standards were built on the improvements in engine and vehicle efficiency required by the Phase 1 emission standards and represent a significant opportunity to achieve further GHG reductions for 2018 and later model year heavy-duty vehicles, including trailers. 

U.S. EPA and NHTSA issued a Notice of Proposed Rulemaking for Phase 2 in June 2015, and finalized the final rule in August 2016.  ARB staff plans to bring a proposed California Phase 2 program before the Board in 2017. ARB staff remains committed to a strong national program which will support California's GHG reduction commitments. 

What's New


Posted August 16, 2016:
Final Federal Rule
The Final Rule: Phase 2 Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles has been posted on the U.S. Environmental Protection Agency and the National Highway Traffic Safety Administration websites.

ARB Press Release on Federal Rule
ARB's Chair Mary D. Nichols' statement on federal Phase 2 standards, which reduce GHG emissions from medium- and heavy- duty engines and vehicles.



Posted October 1, 2015:
ARB Comments on Proposed Federal Rule

Today, ARB submitted comments on the U.S. EPA and NHTSA Phase 2 Notice of Proposed Rulemaking and Regulatory Impact Analysis (Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles).  In August, ARB submitted comments on NHTSA Phase 2 Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles: Draft Environmental Impact Statement.


Posted June 19, 2015:
Proposed Federal Rule
Proposed Phase 2 Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles has been posted for public comment on the U.S. Environmental Protection Agency and the National Highway Traffic Safety Adminstration websites.  ARB's Chair Mary D. Nichols released a statement welcoming the proposed Phase 2 standards.


Posted June 12, 2015:
In April 2015, ARB conducted a Symposium on California's Development of its Phase 2 Greenhouse Gas Emission Standards for On-Road Heavy-Duty Vehicles.  The summary of the California Phase 2 symposium has been posted on the Workshops table below.


Posted June 12, 2015:
ARB's Draft Technology Assessment: Engine/Powerplant and Drivetrain Optimization and Vehicle Efficiency has been released for public comment.  The draft assessment evaluates the potential of various technologies to improve heavy-duty truck fuel efficiency.  These same technologies are being evaluated by U.S. EPA and NHTSA as part of the federal Phase 2 regulatory development process.  This report can be accessed at the Technology and Fuels Assessment Reports webpage.


Posted April 20, 2015:

To access the final April 22, 2015,  agenda and symposium presentations, please click on the links in the table below.  For those unable to attend in person, the symposium can be accessed via webcast.
The symposium is on the ARB staff's development of California 's Phase 2 greenhouse gas emissions standards for on-road heavy-duty vehicles and is not related to the ARB's Truck and Bus Regulation.  


Posted March 26, 2015:
The staff of the ARB invites you to attend a symposium on California's development of its Phase 2 GHG emission standards for on-road heavy-duty vehicles. Representatives from government agencies, engine manufacturers, component suppliers, environmental policy and technical research organizations, and trucking fleets will participate in panel discussions concerning strategies and technologies available to reduce GHG emissions.
The symposium will be held Wednesday, April 22, 2015, 9:00 a.m. to 5:30 p.m. in Diamond Bar, California.

Workshops

Date/Time Description Documents
April 22, 2015/
9:00 a.m.
Symposium on California's Development of its Phase 2 Greenhouse Gas Emission Standards for On-Road Heavy-Duty Vehicles Agenda
Presentations
Summary

Contacts

For more information, please contact:

Inder Atwal, Air Pollution Specialist, at (916) 445-0281.