Question

respiratory protection may be required when working around concrete and masonry because ____. concrete dust has a terrible odor concrete dust can cause pneumonia concrete contains asbestos concrete dust can cause silicosis which of the following is typically worn when working in an atmosphere containing dust? supplied air mask gas mask half mask scba

Explanation:

Concrete dust contains crystalline silica, exposure to which can cause silicosis, a serious lung - disease, so respiratory protection is needed. When working in a dusty atmosphere, a half - mask is typically worn as it can filter out dust particles. A supplied air mask is for more hazardous environments with low oxygen or high - toxicity substances, a gas mask is for gas protection, and SCBA (Self - Contained Breathing Apparatus) is for extreme situations like firefighting in low - oxygen or highly toxic areas.

Answer:

1. D. concrete dust can cause silicosis
2. C. half mask