Threshold limit value of copper in the atmospheric air is

Options

A. 0.001 mg/`m^3`
B. 0.01 mg/`m^3`
C. 1.0 mg/`m^3`
D. 5.0 mg/`m^3`

Answer

C

Explanation

Inspirable copper dust takes a predominantly fibrous effect. The ALV of copper aerosol in the workplace atmosphere is `0.5 mg//m^3`, while the thresh old limit value (TLV) is 1.0 mg/ `m^3`