Ann. occup. Hyg., Vol. 44, No. 4, pp. 271-280, 2000
© 2000 British Occupational Hygiene Society
Published by Oxford University Press
Trends in levels of inhalable dust exposure, exceedance and overexposure in the European carbon black manufacturing industry
Institute of Occupational Health, University of Birmingham, Birmingham B15 2TT, UK Department of Environmental Sciences, Environmental and Occupational Health Group, Wageningen Agricultural University, Wageningen, The Netherlands
Tel.: +44 121 414 6046; Fax: +44 121 471 5208
Received 4 March, 1999; Revised 8 November, 1999.
In an attempt to investigate the relationship between exposure to carbon black and respiratory morbidity, a study of the complete carbon black manufacturing industry in Western Europe was commissioned. As part of this study, a large number of personal inhalable (n=8015) dust exposure measurements was taken during three phases of data collection between 1987 and 1995. Repeated measurements on the same worker were taken in the last two phases, which enabled the estimation of the within- and between-worker components of variance. Simultaneously, the fixed effects of phase and factory were estimated using mixed-effects analysis of variance.
The results show that the personal inhalable dust exposure has reduced significantly since the first phase of the study. In addition, the interaction term between phase and factory was significant in most job categories, confirming that the reduction of exposure was not equal across all factories.
When all factories were considered together, the probability that the mean exposure of a randomly selected worker (overexposure) or the probability that the exposure on a randomly selected day for a randomly selected worker (exceedance) was higher than 3.5mg m-3, was 10% or less for all job categories in the last phase. However, when the factories were considered separately, it appeared that the probability of overexposure or exceedance was in excess of 10% for the job categories ‘Fitter/Welder’, ‘Warehouseman’ and ‘Site crew’ for a number of factories. Therefore, even though exposure levels of inhalable dust have dropped considerably across the whole carbon black manufacturing industry in Western Europe, further reductions in exposure levels are required in these areas to make sure that the probability of overexposure and exceedance falls below a level of 10%.
carbon black; inhalable dust; compliance; exceedance; overexposure
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