Standard Interpretations - Table of Contents|
| Standard Number:||1910.1000 TABLE Z-3|
Year DeathsSilicosis, a type of pneumoceniosis, is caused by inhalation of fire dust containing crystalline silica (free silica). It is a disabling, progressive and sometimes fatal pulmonary fibrosis characterized by the presence of nudulations in the lungs. The clinical signs and symptoms of silicosis tend to be progressive with continued exposure to quantities of dust containing free silica. Signs and symptoms include cough, dyspnea, wheezing, and repeated nonspecific chest illness. Impaired pulmonary function may be progressive. In individual cases there may be little or no decrement when simple discrete nodular silicosis is present, but when nodulations become larger or when conglomoration occurs, recognizable cardiopulmonary impairment occurs. Progression of signs or symptoms usually continues after dust exposure ceases. The risk of onset and the rate of progression of the pulmonary lasion is related to the character of the exposure (dust concentration and duration). The disease occurs after an exposure is measured in years rather than months. Occasionally, exposures to very high concentrations for short periods of time cause the development of acute silicosis.
1976 - 215
1977 - 193
1978 - 168
1979 - 222
1980 - 207
10 mg/m(3) Crystalline Silica = ---------------------- (respirable) % Silica + 2 30 mg/m(3) Crystalline Silica = ---------------------- (total dust) % Silica + 2OSHA's health standards require employers to implement engineering or administrative controls to reduce employee exposure to toxic air contaminants within the PEL whenever feasible. Since it is not feasible to control silica exposure during a sandblasting operation, respirators such as supplied air respirators approved for abrasive blasting are permissible to reduce worker exposure to free silica during the blasting operation. A properly operated and maintained approved abrasive blasting respirator may provide adequate protection to the wearer.
|Standard Interpretations - Table of Contents|
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