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Clean air should contain less than __________ of suspended impurity per cubic metre.(a) 0.5 mg(b) 1.5 mg(c) 2.5 mg(d) 3.5 mgI got this question in homework.I'd like to ask this question from Functional Requirements of Ventilation System in section Acoustics and Ventilation of Construction & Building Materials

Answer»

The correct answer is (a) 0.5 MG

To explain I would say: Clean air should contain less than 0.5 mg of suspended impurity per cubic METRE. Also, it should have less than 0.5 part per MILLION of SO₂. Air should be free from toxic FUMES of gases and harmful particles.



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