Document Detail

Exposures and Cross-shift Lung Function Declines in Wildland Firefighters.
MedLine Citation:
PMID:  24568319     Owner:  NLM     Status:  Publisher    
ABSTRACT Respiratory problems are common among wildland firefighters. However, there are few studies directly linking occupational exposures to respiratory effects in this population. Our objective was to characterize wildland firefighting occupational exposures and assess their associations with cross-shift changes in lung function. We studied 17 members of the Alpine Interagency Hotshot Crew with environmental sampling and pulmonary function testing during a large wildfire. We characterized particles by examining size distribution and mass concentration, and conducting elemental and morphological analyses. We examined associations between cross-shift lung function change and various analytes, including levoglucosan, an indicator of wood smoke from burning biomass. The levoglucosan component of the wildfire aerosol showed a predominantly bimodal size distribution: a coarse particle mode with a mass median aerodynamic diameter about 12 μm and a fine particle mode with a mass median aerodynamic diameter <0.5 μm. Levoglucosan was found mainly in the respirable fraction and its concentration was higher for fire line construction operations than for mop-up operations. Larger cross-shift declines in forced expiratory volume in one second were associated with exposure to higher concentrations of respirable levoglucosan (p <0.05). Paired analyses of real-time personal air sampling measurements indicated that higher carbon monoxide (CO) concentrations were correlated with higher particulate concentrations when examined by mean values, but not by individual data points. However, low CO concentrations did not provide reliable assurance of concomitantly low particulate concentrations. We conclude that inhalation of fine smoke particles is associated with acute lung function decline in some wildland firefighters. Based on short-term findings, it appears important to address possible long-term respiratory health issues for wildland firefighters. [Supplementary materials are available for this article. Go to the publisher's online edition of Journal of Occupational and Environmental Hygiene for the following free supplemental resources: a file containing additional information on historical studies of wildland fire exposures, a file containing the daily-exposure-severity questionnaire completed by wildland firefighter participants at the end of each day, and a file containing additional details of the investigation of correlations between carbon monoxide concentrations and other measured exposure factors in the current study.].
Denise M Gaughan; Chris A Piacitelli; Bean T Chen; Brandon F Law; M Abbas Virji; Nicole T Edwards; Paul L Enright; Diane E Schwegler-Berry; Stephen S Leonard; Gregory R Wagner; Lester Kobzik; Stefanos N Kales; Michael D Hughes; David C Christiani; Paul D Siegel; Jean M Cox-Ganser; Mark D Hoover
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-2-25
Journal Detail:
Title:  Journal of occupational and environmental hygiene     Volume:  -     ISSN:  1545-9632     ISO Abbreviation:  J Occup Environ Hyg     Publication Date:  2014 Feb 
Date Detail:
Created Date:  2014-2-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101189458     Medline TA:  J Occup Environ Hyg     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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