Nuclei-mode particulate emissions and their response to fuel sulfur content and primary dilution during transient operations of old and modern diesel engines.

  title={Nuclei-mode particulate emissions and their response to fuel sulfur content and primary dilution during transient operations of old and modern diesel engines.},
  author={Z. Gerald Liu and Victoria N. Vasys and David B. Kittelson},
  journal={Environmental science \& technology},
  volume={41 18},
The effects of fuel sulfur content and primary dilution on PM number emissions were investigated during transient operations of an old and a modern diesel engine. Emissions were also studied during steady-state operations in order to confirm consistency with previous findings. Testing methods were concurrent with those implemented by the EPA to regulate PM mass emissions, including the use of the Federal Transient Testing Procedure-Heavy Duty cycle to simulate transient conditions and the use… 
Effect of advanced aftertreatment for PM and NOx reduction on heavy-duty diesel engine ultrafine particle emissions.
The catalyst reduced the toxicity measured in chemical and cellular assays suggesting a pathway for an inverse correlation between particle number and toxicity.
Volatile properties of particles emitted by compressed natural gas and diesel buses during steady-state and transient driving modes.
It is suggested that these nonvolatile particles emitted by CNG and diesel buses were composed mostly of ash from lubricating oil, similar to those produced during hard acceleration from rest.
Vehicle engines produce exhaust nanoparticles even when not fueled.
The particles' characteristics indicate that their emissions can be reduced using exhaust after-treatment devices, although these devices have not been mandated for all relevant vehicle types.
A Source Dilution Sampling System for Characterization of Engine Emissions under Transient or Steady-State Operation
With increasingly stringent regulations being placed upon engine emissions, an in-depth understanding of engine exhaust composition will be necessary to assess environmental and health impacts and to
Effects of intake pressure on particle size and number emissions from premixed diesel low-temperature combustion
In this study, 10 premixed diesel low-temperature combustion engine operating conditions were chosen based on engine intake pressure (1.2–1.6 bar), intake oxygen concentration (10%, 11%, and 12%),
Effect of Heavy-Duty Diesel Engine Operating Parameters on Particle Number and Size Distribution at Low Speed Condition
Experiments and simulations were used to investigate the effect of a range of engine operating parameters and fuel characteristics on the particle size and particle number (PN) concentration at low
Evaluation of carcinogenic hazard of diesel engine exhaust needs to consider revolutionary changes in diesel technology.


Influence of diesel fuel sulfur on nanoparticle emissions from city buses.
Particle emissions from twelve buses, operating alternately on low sulfur (LS) and ultralow sulfur (ULS) diesel fuel, were monitored, suggesting that sulfur in diesel fuel was playing a major role in the formation of nanoparticles.
Characterization of fuel and aftertreatment device effects on diesel emissions.
Heavy-duty diesel engines operated with a low-sulfur (LS)* fuel and either a particle trap or an oxidation catalytic converter (OCC) have been studied during steady-state operation to determine the effects of these devices on regulated and unregulated emissions, including the chemical and biological character of the exhaust.
Nucleation particles in diesel exhaust: composition inferred from in situ mass spectrometric analysis.
Evidence is found that if nucleation occurs, sulfuric acid/water is the nucleating agent and that the production of nucleation particles even at high engine load can be suppressed by using low-sulfur fuel.
A dilution source sampling system is augmented to measure the size-distributed chemical composition of fine particle emissions from motor vehicles. Measurements are made using an optical particle
Internal combustion engine fundamentals
1 Engine Types and Their Operations 2 Engine Design and Operating Parameters 3 Thermochemistry of Fuel-Air Mixtures 4 Properties of Working Fluids 5 Ideal Models of Engine Cycles 6 Gas Exchange
[Air pollution and health].
  • B. Brunekreef
  • Environmental Science
    Nederlands tijdschrift voor geneeskunde
  • 2018
Concerns about the effects of air pollution in the Netherlands have been expressed in an open letter to Dutch Members of Parliament by a large number of pulmonologists.