The chemical substance of photochemical smog responsible for eye irritation is

How is electricity produced in a thermal power station?

The greenhouse effect is related to

Green plants use carbon dioxide during photosynthesis and release oxygen,yet carbon dioxide is considered responsible for the greenhouse effect. Why?

The $F^{-}$ ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.

Which of the following statements is not true about classical smog?