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How much GHG is contributed by these vehicles?

The category of Medium and Heavy Duty Vehicles (MDHV) encompasses a variety of vehicles with engines that are largely gasoline or diesel fueled. They include large pickup trucks and vans, delivery trucks, box trucks, school and transit buses, and long-haul delivery trucks. The best way to reduce emissions from this class of vehicles is to replace them with electric versions of the same or similar vehicles.

  1. Emission inventory data for GHG
  2. Emission inventory data for criteria pollutants
  3. Emission inventory data for black carbon

What is a medium/heavy duty vehicle?

Anything more than 8,500 lbs GVWR (Class 2b-8)

Picture of the different vehicles by class

NJ fleet distribution


Chart of the percentages of vehicles by class
Photo of wind turbines next to a highway

1. Emission inventory data for GHG

US: Energy-related CO2 emissions account for 86% of all greenhouse gases in the United States. After three years of continuous decline, these emissions rose in 2018. It is estimated that the United States economy-wide emissions increased by 1.5% to 2.5% in 2018. Driving this trend are the emissions from the transportation and industrial sectors, which increased in 2017 and accelerated in 2018 due to strong economic growth. While the decrease in economic activity due to the pandemic of 2020-21 led to a drop in greenhouse gas emissions, this downturn is not expected to continue.

NJ: New Jersey’s total gross greenhouse gas emissions in 2018 reached 105.1 million metric tons (MMT) of carbon dioxide equivalent, or CO2 e, which is a term used to compare the emissions from various greenhouse gases based on their Global Warming Potential to the reference gas of CO2, which has a Global Warming Potential of 1 (NJDEP 2019a). However, it is also estimated that the state’s land sector (forests and associated land cover) sequestered the equivalent of 8.1 MMTCO2 e resulting in net greenhouse gas emissions of 97.0 MMTCO2 e for 2018. The bulk of the 2018 greenhouse gas emissions were energy related, coming from transportation, electric generation, commercial and residential heating and industrial sources. The goal for 2050 is to get to 24.1 MMTCO2 e which is an 80% reduction below our 2006 baseline (N.J.S.A. 26:2C-37).

The transportation sector remains the largest source of greenhouse gas emissions in the state with 40.6 MMTCO2 e in 2018, which is 42% of all CO2e in NJ. Medium and heavy-duty vehicles are responsible for approximately 35% of all on-road greenhouse gas emissions, which make up the bulk of the transportation sector contribution. To visualize the contribution of the transportation sector to statewide greenhouse gas emissions, look at the bar chart in Figure 3.6. New Jersey Greenhouse Gas Emission Trends by Sector.

Note: A carbon sink is any reservoir (typically land or ocean) that absorbs and stores carbon for an indefinite period thereby lowering concentrations in the atmosphere.

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2. Emission inventory data for criteria pollutants

In order to determine the annual emissions of priority pollutants, the following percentages of mobile on-road emissions from medium and heavy duty vehicles (MHDVs) from total mobile on-road emissions were applied to existing inventory data at It should be noted that MHDV emissions are disproportionate to their population and vehicle miles traveled (VMT), since per-mile emissions from MHDVs is much higher than LDVs. MHDVs are about 7.5% of the on-road vehicle population and about 12% of the VMT. For statewide NOx contributions, MHDVs contribute a substantial 31% of all emissions and need to be reduced to meet ozone requirements and climate goals.

VOC 36%     9,113
NOx 74%     40,636
CO   32%     106,598
PM   40%     1,090
SOx 32%     92

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Charts if NJ 2017 Nitrogen Oxides projected emissions inventory and NJ 2017 Fine Particulate Matter projected emissions inventory
Photo of exhaust smoke

3. Emission inventory data for black carbon

Most U.S. emissions of black carbon come from mobile sources (52%), especially diesel engines and vehicles. As much as 98% of all NJ diesel emissions come from MHDV, since there are comparatively few diesel light duty vehicles (cars and SUVs). New Jersey is in the process of completing an inventory of black carbon in the state.

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