CUED Publications database

Long-Term Fuel-Specific NO<inf>x</inf> and Particle Emission Trends for In-Use Heavy-Duty Vehicles in California

Haugen, MJ and Bishop, GA (2018) Long-Term Fuel-Specific NO<inf>x</inf> and Particle Emission Trends for In-Use Heavy-Duty Vehicles in California. Environmental Science and Technology, 52. pp. 6070-6076. ISSN 0013-936X

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Abstract

© 2018 American Chemical Society. Two California heavy-duty fleets have been measured in 2013, 2015, and 2017 using the On-Road Heavy-Duty Measurement System. The Port of Los Angeles drayage fleet has increased in age by 3.3 model years (4.2-7.5 years old) since 2013, with little fleet turnover. Large increases in fuel-specific particle emissions (PM) observed in 2015 were reversed in 2017, returning to near 2013 levels, suggesting repairs and or removal of high emitting vehicles. Fuel-specific oxides of nitrogen (NOx) emissions of this fleet have increased, and NOx after-treatment systems do not appear to perform ideally in this setting. At the Cottonwood weigh station in northern California, the fleet age has declined (7.8 to 6 years old) since 2013 due to fleet turnover, significantly lowering the average fuel-specific emissions for PM (-87%), black carbon (-76%), and particle number (-64%). Installations of retrofit-diesel particulate filters in model year 2007 and older vehicles have further decreased particle emissions. Cottonwood fleet fuel-specific NOx emissions have decreased slightly (-8%) during this period; however, newer technology vehicles with selective catalytic reduction systems (SCR) promise an additional factor of 4-5 further reductions in the long-haul fleet emissions as California transitions to an all SCR-equipped fleet.

Item Type: Article
Uncontrolled Keywords: Air Pollutants California Environmental Monitoring Los Angeles Motor Vehicles Soot Vehicle Emissions
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 30 Nov 2020 20:02
Last Modified: 21 Jan 2021 05:29
DOI: 10.1021/acs.est.8b00621