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Noise exposure and hearing conservation in U. S. coal mines - a surveillance report.

Authors
Joy-GJ; Middendorf-PJ
Source
J Occup Environ Hyg 2007 Jan; 4(1):26-35
NIOSHTIC No.
20031451
Abstract
This study examines the patterns and trends in noise exposure documented in data collected by Mine Safety and Health Administration inspectors at U.S. coal mines from 1987 through 2004. During this period, MSHA issued a new regulation on occupational noise exposure that changed the regulatory requirements and enforcement policies. The data were examined to identify potential impacts from these changes. The overall annual median noise dose declined 67% for surface coal mining and 24% for underground coal mining, and the reduction in each group accelerated after promulgation of the new noise rule. However, not all mining occupations experienced a decrease. The exposure reduction was accompanied by an increase of shift length as represented by dosimeter sample duration. For coal miners exposed above the permissible exposure level, use of hearing protection devices increased from 61% to 89% during this period. Participation of miners exposed at or above the action level in hearing conservation programs rapidly reached 86% following the effective date of the noise rule. Based on inspection data, the occupational noise regulation appears to be having a strong positive impact on hearing conservation by reducing exposures and increasing the use of hearing protection devices and medical surveillance. However, the increase in shift duration and resulting reduction in recovery time may mitigate the gains somewhat.
Keywords
Safety-practices; Safety-research; Shift-work; Noise-control; Noise-levels; Noise-measurement; Noise-pollution; Noise-protection; Noise-shielding; Noise-induced-hearing-loss; Hearing-disorders; Hearing-protection; Hearing-conservation; Personal-protection; Protective-equipment; Protective-measures; Medical-screening; Medical-treatment; Medical-monitoring; Mining-industry; Coal-mining; Hearing-loss; Hearing-impairment; Underground-mining
Contact
Gerald Joy, NIOSH, RHCB, P.O. Box 18070, Pittsburgh, PA 15236-0070
CODEN
JOEHA2
Publication Date
20070101
Document Type
Journal Article
Email Address
gej3@cdc.gov
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
1545-9624
NIOSH Division
PRL
Source Name
Journal of Occupational and Environmental Hygiene
State
PA
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