Maximum allowable concentration of CO2 in air for safe working is ____________

Question

Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?

Options:

A . 50

B . 1000

C . 2000

D . 5000

Answer: Option D
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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More Questions on This Topic :

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Question 4. Aerobic biological oxidation ponds used for the purification of polluted water__________________?....

Question 5. Iron & manganese present in the polluted water is removed by __________________?....

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Question 7. BOD of raw municipal sewage may be in the range of about _____________ mg/litre?....

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Question 9. Presence of ____________ in water stream are deleterious to aquatic life?....

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