Heavy-duty vehicles and NOx

Heavy-duty vehicles, defined as those weighing over 10,000 pounds, contribute disproportionately to global warming and local air pollution. Despite making up only 10% of vehicles on the road, they generate over 25% of transportation sector emissions. Diesel engines emit nitrogen oxides (NOx), ground-level ozone, and particulate matter (PM), which cause respiratory and heart diseases and increase cancer risks. These pollutants disproportionately affect low-income BIPOC communities located near highways. The document argues that switching to electric heavy-duty vehicles can eliminate tailpipe emissions and reduce operating costs, while emphasizing the need for stricter emissions limits on remaining diesel trucks due to their long operational lifespans.

• Heavy-duty vehicles (those weighing more than 10,000 pounds) are responsible for a disproportionate amount of transportation emissions; while they represent only 10% of vehicles on the road, they produce more than 25% of the total global warming emissions from the transportation sector.
• Diesel-powered heavy-duty vehicles emit a mixture of pollutants including Nitrogen Oxides (NOx), which cause lung irritation and contribute to ground-level ozone; ground-level ozone (O3), which inflames airways and can lead to heart disease; and Particulate Matter (PM), which increases cancer risk and threatens the immune system.
• Heavy-duty vehicle pollution creates an environmental injustice, as low-income Black, Indigenous, and People of Color (BIPOC) communities living near highways experience disproportionate exposure to pollutants and higher rates of health inequities.
• Transitioning to electric heavy-duty vehicles eliminates tailpipe emissions and provides lower, more predictable operating costs over the vehicle's lifetime compared to fossil fuel vehicles, despite higher initial upfront costs.
• Because tractor-trailers can remain in service for 30 years and travel over a million miles, it is essential to enforce strict emissions limits and efficiency standards for new diesel trucks during the transition to electrification.

APA

Union of Concerned Scientists (2022). Heavy-duty vehicles and NOx. https://www.ucs.org/resources/heavy-duty-vehicles-and-nox

Chicago

Union of Concerned Scientists. Heavy-duty vehicles and NOx. 2022. https://www.ucs.org/resources/heavy-duty-vehicles-and-nox.

Wikipedia

{{cite report |author=Union of Concerned Scientists |title=Heavy-duty vehicles and NOx |date=11 February 2022 |url=https://www.ucs.org/resources/heavy-duty-vehicles-and-nox |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{unionofconcernedscientists2022heavyduty, author = {{Union of Concerned Scientists}}, title = {{Heavy-duty vehicles and NOx}}, institution = {Union of Concerned Scientists}, year = {2022}, month = feb, url = {https://www.ucs.org/resources/heavy-duty-vehicles-and-nox}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }