Environmental Engineering in CE

Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about _____ ppm.

  • A. <1
  • B. 10-100
  • C. 100-200
  • D. 100-1000
Answer: Option A.
Explanation: 

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