Chemistry
Photo chemical smog is a resultant of the reaction among

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

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Chemistry
Ammonial is a mixture of

Aluminium powder and potassium nitrate
Aluminium powder and ammonium chloride
Aluminium powder and ammonium sulphate
Aluminium powder and ammonium nitrate

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