Q.

Threshold limit value of copper in the atmospheric air is -

A. 0.001 mg/m3
B. 0.01 mg/m3
C. 1.0 mg/m3
D. 5.0 mg/m3
Answer» C. 1.0 mg/m3
Explanation: Inspirable copper dust takes a predominantly fibrous effect. The ALV of copper aerosol in the workplace atmosphere is 0.5 mg/m3, while the threshold limit value (TLV) is 1.0 mg/m3.
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