When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?

Related Mcqs:

The upper layer of atmosphere is called the ____________________?

A. Stratosphere B. Troposphere C. Ionosphere D. None of these...

Which of the following is not a natural source of air pollution ?

A. Volcanic eruptions and lightening discharges B. Biological decay of vegetable matter C. Photochemical oxidation of organic matter D. None of these...

Beyond what concentration of H2S in air, acute danger to human life exists ?

A. 50 ppm B. 100 ppm C. 300 ppm D. 700 ppm...

Exposure to chemicals having carcinogenic properties cause ____________________?

A. Dermatitis (skin disorder) B. Cancer C. Asphyxiation (suffocation) D. Asthma...

Inhalation of silica dust by human being causes ___________________?

A. Asphyxiation B. Shortness of breath C. Tuberculosis D. Both B. & C....