Eye irritation is a common phenomenon during smog. It is mostly caused by which of the following? Choose the correct answer from the options given below.

Eye irritation in smog comes mainly from formaldehyde, peroxyacetyl nitrate and acrolein, which sting the eyes on contact.

Statement 1 holds because formaldehyde is a sharp irritant that stimulates the eyes.

Statement 2 holds because peroxyacetyl nitrate is a strong photochemical eye irritant in smog.

Statement 4 holds because acrolein readily irritates the eyes and airways.

Statement 3 is set aside because ozone mainly attacks the respiratory tract rather than causing the eye stinging in question.

These irritants form in the sunlit reactions that create photochemical smog.