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

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

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Environmental Engineering in CE
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

Of clotting of blood
Of jamming of respiratory tract
It forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen
It forms CO₂ by combining with oxygen present in the blood

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