Chemistry
The main use of salt in the diet is to

produce in small amounts the hydrochloric acid required for the digestion of food
increase the solubility of food particles in water
ease the process of cooking
make the taste of food better

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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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