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A case-control study of airways obstruction among construction workers
Background: While smoking is the major cause of chronic obstructive pulmonary disease (COPD), occupational exposures to vapors, gases, dusts, and fumes (VGDF) increase COPD risk. This case-control study estimated the risk of COPD attributable to occupational exposures among construction workers. Methods: The study population included 834 cases and 1243 controls participating in a national medical screening program for older construction workers between 1997 and 2013. Qualitative exposure indices were developed based on lifetime work and exposure histories. Results: Approximately 18% (95%CI ...
Standardisation of the measurement of capture efficiency of on-gun extraction for welding
The inhalation of welding fume is recognised as being a real threat to workers' health due to the development of occupational illnesses such as welding fume fever and asthma. Local exhaust ventilation (LEV) is an effective method to control worker exposure to welding fume and previous work has indicated the merit of the use of on-gun extraction systems. The aim of the present study was to improve and refine the existing on-gun extraction methodology and has resulted in the development of two alternative methods for measuring the efficiency of on-gun fume extraction systems. There are distinct...
Biological Effects of Emissions From Resistance Spot Welding of Zinc-Coated Material After Controlled Exposure of Healthy Human Subjects
Objective: Do emissions from a resistance spot welding process of zinc-coated materials induce systemic inflammation in healthy subjects after exposure for 6 hours? Methods: Twelve healthy male subjects were exposed once for 6 hours either to filtered ambient air or to welding fume from resistance spot welding of zinc-coated material (mass concentration approximately 100 μg m−3). Biological effects were measured before, after, and 24 hours after exposure. Results: At the concentrations used in this study, however, the suspected properties of ultrafine particles did not lead to systemic...
Relationship Between Welding Fume Concentration and Systemic Inflammation After Controlled Exposure of Human Subjects With Welding Fumes From Metal Inert Gas Brazing of Zinc-Coated Materials
Objectives: It has been shown that exposure of subjects to emissions from a metal inert gas (MIG) brazing process of zinc-coated material led to an increase of high-sensitivity C-reactive protein (hsCRP) in the blood. In this study, the no-observed-effect level (NOEL) for such emissions was assessed. Methods: Twelve healthy subjects were exposed for 6 hours to different concentrations of MIG brazing fumes under controlled conditions. High-sensitivity C-reactive protein was measured in the blood. Results: For welding fumes containing 1.20 and 1.50 mg m−3 zinc, high-sensitivity C-reactive protein...

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