Environmental Engineering in CE
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes

Irritation in eyes
Poor visibility due to sky darkening
All of these
Respiratory trouble

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Environmental Engineering in CE
Aerobic biological oxidation ponds used for the purification of polluted water

All of these
Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents
Destroys/removes pathogen from the sewage
Destroys/removes pathogen much more effectively if the sewage is chlorinated

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