Photochemical smog is highly irritating to the eyes and respiratory system because it contains powerful oxidants like ozone and PAN (peroxyacetyl nitrate)

These chemicals react with delicate tissues, causing burning sensations in the eyes and coughing or throat irritation in humans. The other statements are correct: it is an oxidizing smog formed by solar-driven reactions, and carbon monoxide is not a primary participant in its formation

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