Chemistry
Photo chemical smog is a resultant of the reaction among

CO, O2 and peroxy acetyl nitrate in the presence of Sunlight
NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight
High concentration of NO2, O3, and CO in the evening
CO, CO2 and NO2at low temperature

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Chemistry
Man dies in the atmosphere of CO, because it

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

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