Estimated Cost of Diesel Emissions-Control Technology To Meet Future California Low NOₓ Standards in 2024 and 2027

Nitrogen oxide (NOₓ) emissions from diesel engines in heavy duty vehicles (HDVs) are a major cause of air quality problems and ozone pollution in the United States. The U.S. Environmental Protection Agency’s (EPA) 2010 standard for heavy-duty engine emissions led to major reductions in diesel emission, but a large gap exists between actual and certified NOₓ emissions from HDVs. In California, real-world control of NOₓ emissions from the expanding HDV fleet is needed to meet air quality goals for 2024. The California Air Resources Board (CARB) is preparing new regulations to fix weaknesses in the current federal standard. An important part of this regulatory process is the assessment of the cost of emission control technology. CARB intends to improve California’s HDV engine emission standards. Crucial changes include lower NOₓ emissions, with long-term targets set 90% below today's limits, and the adoption of low-load cycle (LLC) to supplement the federal test protocol (FTP) and ensure NOₓ emissions compliance during low-speed driving in urban areas. CARB also proposes increasing the durability requirements and warranties to better reflect HDV operating life span in the U.S and ensure long-term real emissions control. This paper focuses on the cost of the technology needed for CARB’s regulation changes in 2024 and 2027. The cost-estimate methodology follows that outlined in previous work by the International Council on Clean Transportation (ICCT) on light-duty vehicles, HDVs, and off-road vehicles, with each emissions control technology and after-treatment systems being studied independently. Information on costs for each item is derived from available literature, trade publications, suppliers, and expert reviews. Indirect cost values are assessed by methodologies developed by the EPA and added to the manufacturing costs. The effect of time and production learning are also accounted for in 2024 and 2027, and the effect of improved durability requirements is also estimated.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: White Paper
  • Features: Figures; References; Tables;
  • Pagination: 45p

Subject/Index Terms

Filing Info

  • Accession Number: 01746489
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 9 2020 10:49AM