Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Mass, surface area and number metrics in diesel occupational exposure assessment.

Authors
Ramachandran-G; Paulsen-D; Watts-W; Kittelson-D
Source
J Environ Monit 2005 Jul; 7(7):728-735
NIOSHTIC No.
20037393
Abstract
While diesel aerosol exposure assessment has traditionally been based on the mass concentration metric, recent studies have suggested that particle number and surface area concentrations may be more healthrelevant. In this study, we evaluated the exposures of three occupational groups--bus drivers, parking garage attendants, and bus mechanics--using the mass concentration of elemental carbon (EC) as well as surface area and number concentrations. These occupational groups are exposed to mixtures of diesel and gasoline exhaust on a regular basis in various ratios. The three groups had significantly different exposures to workshift TWA EC with the highest levels observed in the bus garage mechanics and the lowest levels in the parking ramp booth attendants. In terms of surface area, parking ramp attendants had significantly greater exposures than bus garage mechanics, who in turn had significantly greater exposures than bus drivers. In terms of number concentrations, the exposures of garage mechanics exceeded those of ramp booth attendants by a factor of 5-6. Depending on the exposure metric chosen, the three occupational groups had quite different exposure rankings. This illustrates the importance of the choice of exposure metric in epidemiological studies. If these three occupational groups were part of an epidemiological study, depending on the metric used, they may or may not be part of the same similarly exposed group (SEG). The exposure rankings (e.g., low, medium, or high) of the three groups also changes with the metric used. If the incorrect metric is used, significant misclassification errors may occur.
Keywords
Airborne-particles; Air-contamination; Biohazards; Biological-effects; Environmental-exposure; Environmental-factors; Environmental-hazards; Exposure-assessment; Exposure-levels; Exposure-methods; Fumes; Health-hazards; Inhalation-studies; Mathematical-models; Medical-surveys; Occupational-exposure; Occupational-hazards; Physiological-effects; Physiological-measurements; Physiological-response; Pollutants; Quantitative-analysis; Risk-analysis; Risk-factors; Statistical-analysis; Surface-properties; Work-environment; Work-operations; Work-performance; Workplace-studies; Work-practices; Author Keywords: acetone; chemical protective gloves; decontamination; degradation; tensile strength; ultimate elongation
Contact
Gurumurthy Ramachandran, Division of Environmental Health Sciences, School of Public Health, University of Minnesota, MMC 807, 420 Delaware Street SE, Minneapolis, MN 55455
CODEN
JEMOFW
Publication Date
20050701
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008434
Issue of Publication
7
ISSN
1464-0325
Source Name
Journal of Environmental Monitoring
State
MN
Performing Organization
University of Minnesota Twin Cities
TOP