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Title: Relationship between Composition and Toxicity of Motor Vehicle Emission Samples

Journal Article · · Environmental Health Perspectives
DOI: https://doi.org/10.1289/ehp.6976 · OSTI ID:1627113
 [1];  [2];  [1];  [3];  [4];  [5];  [1]
  1. Lovelace Respiratory Research Institute, Albuquerque, NM (United States)
  2. Statoil Research Centre, Trondheim (Norway)
  3. Desert Research Institute, Reno, NV (United States)
  4. Southwest Research Institute, San Antonio, TX (United States)
  5. National Renewable Energy Laboratory (NREL), Golden, CO (United States)

In this study we investigated the statistical relationship between particle and semivolatile organic chemical constituents in gasoline and diesel vehicle exhaust samples, and toxicity as measured by inflammation and tissue damage in rat lungs and mutagenicity in bacteria. Exhaust samples were collected from “normal” and “high-emitting” gasoline and diesel light-duty vehicles. We employed a combination of principal component analysis (PCA) and partial least-squares regression (PLS; also known as projection to latent structures) to evaluate the relationships between chemical composition of vehicle exhaust and toxicity. The PLS analysis revealed the chemical constituents covarying most strongly with toxicity and produced models predicting the relative toxicity of the samples with good accuracy. The specific nitro-polycyclic aromatic hydrocarbons important for mutagenicity were the same chemicals that have been implicated by decades of bioassay-directed fractionation. These chemicals were not related to lung toxicity, which was associated with organic carbon and select organic compounds that are present in lubricating oil. The results demonstrate the utility of the PCA/PLS approach for evaluating composition–response relationships in complex mixture exposures and also provide a starting point for confirming causality and determining the mechanisms of the lung effects. Key words: diesel exhaust, gasoline exhaust, hopane, mutagenicity, PAHs, particulate matter health effects, principal component analysis, semivolatile organic carbon, sterane, toxicity of motor vehicle emissions.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1627113
Journal Information:
Environmental Health Perspectives, Vol. 112, Issue 15; ISSN 0091-6765
Publisher:
National Institute of Environmental Health SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Health Effects of Airborne Particulate Matter: Do We Know Enough to Consider Regulating Specific Particle Types or Sources? journal January 2007
Composition of Diesel Particles Influences Acute Pulmonary Toxicity: An Experimental Study in MICE journal January 2008
Health Effects of Organic Aerosols journal January 2008
Ultrafine particles from diesel vehicle emissions at different driving cycles induce differential vascular pro-inflammatory responses: Implication of chemical components and NF-κB signaling journal March 2010
Correlation of in Vitro Cytokine Responses with the Chemical Composition of Soil-Derived Particulate Matter journal March 2006
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