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Journal of Epidemiology and Community Health logoLink to Journal of Epidemiology and Community Health
. 1994 Jun;48(3):237–247. doi: 10.1136/jech.48.3.237

Is living near a coking works harmful to health? A study of industrial air pollution.

R S Bhopal 1, P Phillimore 1, S Moffatt 1, C Foy 1
PMCID: PMC1059953  PMID: 8051521

Abstract

OBJECTIVE--To determine whether there was excess ill health in people living near a coking works, and if so whether it was related to exposure to coking works' emissions. DESIGN--Populations varying in proximity to the coking works were compared with control populations. Health data were correlated with available environmental data. METHODS--Analysis of routinely collected mortality, cancer registration, and birth statistics; community survey using self completed postal questionnaires; retrospective analysis of general practice (GP) records; tests of respiratory function; and analysis of available environmental data. MAIN RESULTS--Study and control populations were comparable in terms of response rates, gender, and most socioeconomic indicators. For adults, age standardised mortality and cancer rates of the population closest to the coking works were comparable with those for the district as a whole. Gender ratios, birthweight, and stillbirth rates were comparable in the study and control populations. For several indicators of respiratory health including cough, sinus trouble, glue ear, and wheeze (but not for asthma and chronic bronchitis) there was a gradient of self reported ill health, with the highest prevalence in areas closest to the works. For example, sinus trouble was reported by 20% of adults and 13% of children in the area closest to the works compared with 13% and 6% respectively in the control area. GP consultations for respiratory disorders increased when pollution (measured by SO2 levels) was high: annual consultation rates per 1000 varied from 752 in the top group of daily pollution levels to 424 in the bottom group. Analysis of locally collected smoke and SO2 data indicated that SO2 concentrations were highest closest to the works and, after closure of the coking works, the number of days on which SO2 and smoke levels exceeded 100 micrograms/m3 and 90 micrograms/m3, respectively, fell steeply. CONCLUSION--Routinely available indicators failed to provide convincing evidence that the coking works had harmed health. Self report and GP consultations indicated that respiratory ill health in the people living close to the works was worse than expected. Some of the excess probably resulted from exposure to coking works emissions. The health effects of relatively low level but intermittently high air pollution from a point source may be subtle, contributing to respiratory morbidity, but not apparent in analysis of routine health indicators.

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Selected References

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