Respiratory health of brickworkers in Cape Town, South Africa. Background, aims and dust exposure determinations.
研究了南非开普敦五家砖厂575名工人的呼吸健康，通过问卷、体检、肺功能测试、胸片和粉尘测量，报告了可吸入粉尘和总粉尘的平均浓度及游离二氧化硅含量，并构建了粉尘暴露指标用于后续分析。
The respiratory health and work environment of 575 brickworkers in five brickworks in Cape Town, South Africa, were investigated by means of a questionnaire, a physical examination, pulmonary function testing, chest radiography, and dust measurements. This study presents the background, aims, and methods of the determining dust exposure assignments. The mean concentrations of respirable dust and total dust were 2.22 and 15.16 mg/m3, respectively, with a mean free-silica percentage of 2.1%. Subjective and objective, as well as categorical and continuous, dust indicators were constructed for subsequent analyses, together with findings from the health survey, which are reported elsewhere.