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1) EPA Proposes Stronger Standards for Heavy-Duty Vehicles to Promote Clean Air, Protect Communities, and Support Transition to Zero-Emissions Future (3.7.22)
https://www.epa.gov/newsreleases/epa-proposes-stronger-standards-heavy-duty-vehicles-promote-clean-air-protect

Today the U.S. Environmental Protection Agency (EPA) is proposing new, stronger standards to promote clean air and reduce pollution from heavy-duty vehicles and engines starting in model year (MY) 2027. The proposed standards would reduce emissions of smog- and soot-forming nitrogen oxides (NOx) from heavy-duty gasoline and diesel engines and set updated greenhouse gas (GHG) standards for certain commercial vehicle categories.  This proposed rule would ensure the heavy-duty vehicles and engines that drive American commerce and connect people across the country are as clean as possible while charting a path to advance zero-emission vehicles in the heavy-duty fleet. . . .
 
Today’s action is the first step in EPA’s “Clean Trucks Plan” – a series of clean air and climate regulations that the agency will develop over the next three years to reduce pollution from trucks and buses and to advance the transition to a zero-emissions transportation future. . . .
 
The proposed revisions to existing GHG standards for MY2027 and beyond would set updated GHG emissions standards for subsectors where electrification is advancing at a more rapid pace.  These sectors include school buses, transit buses, commercial delivery trucks, and short-haul tractors. In a separate action, EPA will be setting new GHG emissions standards for heavy-duty vehicles as soon as model year 2030. This action will more comprehensively address the long-term trend towards zero emissions vehicles across the heavy-duty sector.
 
2) Proposed Rule and Related Materials for Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards
https://www.epa.gov/regulations-emissions-vehicles-and-engines/proposed-rule-and-related-materials-control-air-1

On March 3, 2022, EPA Administrator Regan signed a proposed rule that would set new, more stringent standards to reduce pollution from heavy-duty vehicles and engines starting in model year (MY) 2027. The proposed standards would significantly reduce emissions of smog- and soot-forming nitrogen oxides (NOx) from heavy-duty gasoline and diesel engines and set more stringent greenhouse gas (GHG) standards for certain commercial vehicle categories. This proposal is consistent with President Biden’s Executive Order, “Strengthening American Leadership in Clean Cars and Trucks” and would ensure the heavy-duty vehicles and engines that drive American commerce are as clean as possible while charting a path to advance zero-emission vehicles in the heavy-duty fleet.

The proposal also includes amendments regarding the confidentiality of certain information submitted to EPA for engines, vehicles, and equipment subject to emission standards and other requirements under the CAA. In addition, the proposal includes other limited amendments to the regulations that implement our air pollutant emission standards for other sectors (e.g., light-duty vehicles, marine diesel engines, locomotives, various types of nonroad engines, vehicles, and equipment).

EPA encourages public input into this rulemaking and will hold a virtual public hearing for this rule. The date for this hearing will be announced on this webpage in the near future.   
 
Fact sheet: Heavy-Duty 2027 and Beyond: Clean Trucks Proposed Rulemaking (March 2022, EPA-420-F-22-007) https://www.epa.gov/system/files/documents/2022-03/420f22007.pdf  

3) FR notice inviting public comment by May 13 (3/28) https://www.federalregister.gov/d/2022-04934
4) Comment period extended to May 16 (5/3) https://www.federalregister.gov/d/2022-09497

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