A powerful eye irritant in the smoke is:

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Peroxyacetyle nitrate UP PCS (Pre)-2018. Peroxyacetyl Nitrate (C2H3NO5), also called as PAN, is found in atmosphere by reactions of nitrogen oxides, hydrocarbons and sunlight. It is identified as one of the main components of photochemical smog throughout the planet. Peroxyacetyl nitrate is a powerful eye irritant in smoke. It is a secondary pollutant.

A powerful eye irritant in the smoke is:

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