Environmental Engineering in CE
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes

All of these
Shortness of breath
Asphyxiation (suffocation)
Tuberculosis

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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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