📊 Environmental Engineering
Q. As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is _________ μg/m3.(μg-microgram)
  • (A) 10
  • (B) 90
  • (C) 800
  • (D) 750
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✅ Correct Answer: (B) 90

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