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Environmental Engineering in CE

Environmental Engineering in CE
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

5
2000
1000
100

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Environmental Engineering in CE
When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell.

0.01
1
0.1
4

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Environmental Engineering in CE
80% less than 200 mesh size particles are called

Smoke
Grit
Aggregates
Powder

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Environmental Engineering in CE
The upper layer of atmosphere is called the

None of these
Troposphere
Ionosphere
Stratosphere

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Environmental Engineering in CE
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

CO
SO₂
CFC (chloro fluoro carbons)
NOx

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Environmental Engineering in CE
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)

10
800
90
750

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