Environmental Engineering in CE
Photochemical smog is formed from automobile exhaust

Is harmful for crops and trees also besides causing eye irritation & asthma
All of these
By reaction of hydrocarbon & nitric oxide in presence of sunlight
Appears only on sunny days

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Environmental Engineering in CE
Lagoons used for purification of polluted water

Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre
Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds
Use micro-organisms/bacteria in presence of dissolved oxygen
All of these

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