Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Silicosis
Cancer
Pneumoconiosis
Asthma

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Chemistry
Man dies in the atmosphere of CO, because it

Dries up the blood
Reduces the organic matter of tissues
Combines with O2 present in the body
Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O2

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