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Effect of occupational silica exposure on pulmonary function
Vicki Stover Hertzberg1, Kenneth D Rosenman, Mary Jo Reilly
1Department of Biostatistics, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA. vhertzb@sph.emory.edu
Chest
|August 13, 2002
Summary
Occupational silica exposure is linked to reduced lung function, even at current safety limits. This study highlights the need for lower silica exposure levels and smoking cessation programs for affected workers.
Area of Science:
- Occupational health
- Pulmonary medicine
- Epidemiology
Background:
- Silica dust exposure is a known occupational hazard.
- Previous studies suggest a link between silica exposure and respiratory issues.
- The current Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL) for silica is 0.1 mg/m³.
Purpose of the Study:
- To evaluate the impact of occupational silica exposure on lung function.
- To determine if silica exposure at or below the current OSHA limit affects pulmonary function.
Main Methods:
- An epidemiologic study involving 1,072 current and former workers.
- Data collected through interviews, site visits, and company records (medical, employment, industrial hygiene).
- Spirometry data analyzed, excluding individuals with pre-existing conditions like asbestosis or silicosis.
Main Results:
- Decreased lung function (FVC, FEV1, FEV1/FVC) observed with increasing silica exposure in smokers.
- Logistic regression showed increased odds of abnormal FVC (1.49) and FEV1 (1.68) with 40 years of exposure at the OSHA limit.
- Longitudinal analysis revealed a significant decline in FVC (1.6 mL/yr) and FEV1 (1.1 mL/yr) per mg/m³ mean silica exposure.
Conclusions:
- A clear association exists between cumulative silica exposure and pulmonary function abnormalities, even within the current OSHA regulatory level.
- Results suggest a need to reduce permissible silica air levels.
- Encouraging smoking cessation among silica-exposed workers is recommended.